fix(cmd/ndt7-client): avoid confusing -locate.url help string (#108)

fix(cmd/ndt7-client): remove backticks from -locate.url usage string

The -locate.url flag's usage string contained backticks around
`-locate.token`, which caused the flag package to incorrectly display
the flag name as "-locate.url -locate.token" in help output.

Go's flag package treats backticked text in usage strings as parameter
names to display in help output (e.g., flag.String("I", "", "search
`directory` for files") displays as "-I directory"). The backticks
around -locate.token were being extracted as the parameter name.

Removed the backticks to fix the confusing help display.

See: https://pkg.go.dev/flag#hdr-Usage_messages

Author: bassosimone

cmd/ndt7-client/main.go

@@ -154,9 +154,9 @@ var (
 	flagLocateURL = fset.String(
 		"locate.url",
 		"",
-		"Override the default locate URL. If the URL is empty, we use a suitable"+
-			"https://locate.measurementlab.net/{path} URL where the {path} depends on"+
-			"whether you specified `-locate.token` or not.")
+		"Override the default locate URL. If the URL is empty, we use a suitable "+
+			"https://locate.measurementlab.net/{path} URL where the {path} depends on "+
+			"whether you specified -locate.token or not.")
 )
 
 func init() {