[Bug] 单独配置的[[fallback]]无法正确回落

[HeXis-YS]

Describe the bug【描述 bug】
当回落以[[fallback]]形式单独配置时，被verysimple忽略，导致无法正常回落。
当回落以fallback=形式在[[listen]]内配置时，可以正常回落。

To Reproduce【如何复现该bug】
按提供的配置文件运行verysimple，然后访问8443端口。

Expected behavior【预期的行为】
应该能够访问verysimple回落后的服务。

Envs (please complete the following information):【系统环境】
Clear Linux 38630, Kernel 6.2.1
verysimple 1088b27

Config file 【配置文件，客户端服务端配置都提供】

不能正常回落的配置

[app]
loglevel = 0
logfile = "/root/tmp/vs_log"

[[listen]]
tag = "vless-tcp-in"
protocol = "vlesss"
uuid = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
ip = "0.0.0.0"
port = 8443
version = 0
sniffing.enabled = false
cert = "/usr/local/etc/xray/cert.pem"
key = "/usr/local/etc/xray/cert.key"
extra.tls_minVersion = "1.3"
alpn = ["h2"]

[[fallback]]
from = ["vless-tcp-in"]
dest = "/dev/shm/h2c.sock"

可以正常回落的配置

[app]
loglevel = 0
logfile = "/root/tmp/vs_log"

[[listen]]
tag = "vless-tcp-in"
protocol = "vlesss"
uuid = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
ip = "0.0.0.0"
port = 8443
version = 0
fallback = "/dev/shm/h2c.sock"
sniffing.enabled = false
cert = "/usr/local/etc/xray/cert.pem"
key = "/usr/local/etc/xray/cert.key"
extra.tls_minVersion = "1.3"
alpn = ["h2"]

Debug Log 【Debug日志, 客户端 和 服务端 的 日志 都提供】

异常回落日志

{"L":"INFO ","T":"230301 034029.828","M":"Program started","loglvl":0}
{"L":"INFO ","T":"230301 034029.830","M":"zap log init complete.","logfile":"/root/tmp/vs_log"}
{"L":"INFO ","T":"230301 034029.831","M":"verysimple v1.2.5-1088b279ef77e4c34405ead8913588aaa83f425e, go1.20.1 linux amd64, with advLayer packages: [grpcSimple ws] \n"}
{"L":"INFO ","T":"230301 034029.833","M":"Working at","dir":"/root/tmp/fallback"}
{"L":"DEBUG","T":"230301 034029.834","M":"All Given Flags","flags":{"c":"my string representation"}}
{"L":"INFO ","T":"230301 034029.836","M":"Options","Log Level":"debug","UseReadv":true}
{"L":"INFO ","T":"230301 034029.838","M":"Starting..."}
{"L":"INFO ","T":"230301 034029.840","M":"Listening","tag":"vless-tcp-in","protocol":"tls+vless","listen_addr":"0.0.0.0:8443","defaultClient":"dual+direct","dial_addr":""}
{"L":"INFO ","T":"230301 034035.304","M":"New Accepted Conn","connid":833076,"from":"1.2.3.4:54190","handler":"tls+vless://0.0.0.0:8443#vless-tcp-in"}
{"L":"WARN ","T":"230301 034035.555","M":"Failed handshakeInserver","connid":833076,"handler":"0.0.0.0:8443","client RemoteAddr":"1.2.3.4:54190","error":" [ Vless Invalid version  , Detail: invalid data, Data: 80 ] , with Buffer,len 148"}
{"L":"WARN ","T":"230301 034035.557","M":"Invalid request and no matched fallback, hung up","connid":833076,"client RemoteAddr":"1.2.3.4:54190"}
{"L":"INFO ","T":"230301 034038.905","M":"Program got close signal."}
{"L":"INFO ","T":"230301 034038.907","M":"Stopping..."}

正常回落日志

{"L":"INFO ","T":"230301 034111.605","M":"Program started","loglvl":0}
{"L":"INFO ","T":"230301 034111.607","M":"zap log init complete.","logfile":"/root/tmp/vs_log"}
{"L":"INFO ","T":"230301 034111.609","M":"verysimple v1.2.5-1088b279ef77e4c34405ead8913588aaa83f425e, go1.20.1 linux amd64, with advLayer packages: [grpcSimple ws] \n"}
{"L":"INFO ","T":"230301 034111.610","M":"Working at","dir":"/root/tmp/fallback"}
{"L":"DEBUG","T":"230301 034111.611","M":"All Given Flags","flags":{"c":"my string representation"}}
{"L":"INFO ","T":"230301 034111.613","M":"Options","Log Level":"debug","UseReadv":true}
{"L":"INFO ","T":"230301 034111.616","M":"Starting..."}
{"L":"INFO ","T":"230301 034111.618","M":"Listening","tag":"vless-tcp-in","protocol":"tls+vless","listen_addr":"0.0.0.0:8443","defaultClient":"dual+direct","dial_addr":""}
{"L":"INFO ","T":"230301 034114.790","M":"New Accepted Conn","connid":649965,"from":"1.2.3.4:54034","handler":"tls+vless://0.0.0.0:8443#vless-tcp-in"}
{"L":"WARN ","T":"230301 034115.080","M":"Failed handshakeInserver","connid":649965,"handler":"0.0.0.0:8443","client RemoteAddr":"1.2.3.4:54034","error":" [ Vless Invalid version  , Detail: invalid data, Data: 80 ] , with Buffer,len 148"}
{"L":"DEBUG","T":"230301 034115.082","M":"Fallback to default setting","addr":"/dev/shm/h2c.sock"}
{"L":"DEBUG","T":"230301 034115.084","M":"Default Route","connid":649965,"source":"/dev/shm/h2c.sock","client":"dual+direct","addr":""}
{"L":"INFO ","T":"230301 034115.086","M":"Request","connid":649965,"Fallback from":"1.2.3.4:54034","Target":"unix://%2Fdev%2Fshm%2Fh2c.sock","through":"dual+direct://"}
{"L":"DEBUG","T":"230301 034115.088","M":"handshake client with first payload","connid":649965,"len":148}
{"L":"DEBUG","T":"230301 034115.090","M":"TryCopy","id":649965,"from":"*net.UnixConn","->":"*tlsLayer.conn"}
{"L":"DEBUG","T":"230301 034115.092","M":"copying with readv","id":649965}
{"L":"DEBUG","T":"230301 034115.090","M":"TryCopy","id":649965,"from":"*tlsLayer.conn","->":"*net.UnixConn"}
{"L":"DEBUG","T":"230301 034115.095","M":"copying with classic method","id":649965}
{"L":"INFO ","T":"230301 034118.125","M":"Program got close signal."}
{"L":"INFO ","T":"230301 034118.126","M":"Stopping..."}

Other 【其他】

【注意，配置文件和客户端服务端配置 太长的话，前后加上三个 `, 如 ```】

[SakuraSakuraSakuraChan]

这流量不是h2吧，感觉没必要加alpn