Fix `login add` always go interactive (#221)

Flags are not Args

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/221
Reviewed-by: Norwin <noerw@noreply.gitea.io>
Reviewed-by: techknowlogick <techknowlogick@gitea.io>

cmd/login/add.go

@@ -65,7 +65,7 @@ var CmdLoginAdd = cli.Command{
 
 func runLoginAdd(ctx *cli.Context) error {
 	// if no args create login interactive
-	if ctx.Args().Len() == 0 {
+	if ctx.NumFlags() == 0 {
 		return interact.CreateLogin()
 	}