remove incorrect check on config name

transport/internet/authenticator_json.go

@@ -3,14 +3,10 @@
 package internet
 
 import (
-	"v2ray.com/core/common"
 	"v2ray.com/core/common/loader"
 )
 
 func RegisterAuthenticatorConfig(name string, configCreator loader.ConfigCreator) error {
-	if _, found := authenticatorCache[name]; found {
-		return common.ErrDuplicatedName
-	}
 	return configCache.RegisterCreator(name, configCreator)
 }