generate/seccomp: remove double package import

The same package is imported twice for no reason.

Reported by staticcheck:

> generate/seccomp/seccomp_default.go:6:2: ST1019: package "github.com/opencontainers/runtime-spec/specs-go" is being imported more than once (staticcheck)
>	"github.com/opencontainers/runtime-spec/specs-go"
>	^
>generate/seccomp/seccomp_default.go:7:2: ST1019(related information): other import of "github.com/opencontainers/runtime-spec/specs-go" (staticcheck)
>	rspec "github.com/opencontainers/runtime-spec/specs-go"

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

generate/seccomp/seccomp_default.go

@@ -3,7 +3,6 @@ package seccomp
 import (
 	"runtime"
 
-	"github.com/opencontainers/runtime-spec/specs-go"
 	rspec "github.com/opencontainers/runtime-spec/specs-go"
 )
 
@@ -31,7 +30,7 @@ func arches() []rspec.Arch {
 }
 
 // DefaultProfile defines the whitelist for the default seccomp profile.
-func DefaultProfile(rs *specs.Spec) *rspec.LinuxSeccomp {
+func DefaultProfile(rs *rspec.Spec) *rspec.LinuxSeccomp {
 	syscalls := []rspec.LinuxSyscall{
 		{
 			Names: []string{