Clean unnecessary code in Trojan

proxy/trojan/config.go

@@ -13,7 +13,6 @@ import (
 type MemoryAccount struct {
 	Password string
 	Key      []byte
-	Flow     string
 }
 
 // AsAccount implements protocol.AsAccount.
@@ -23,7 +22,6 @@ func (a *Account) AsAccount() (protocol.Account, error) {
 	return &MemoryAccount{
 		Password: password,
 		Key:      key,
-		Flow:     a.Flow,
 	}, nil
 }