Remove unused setting time.FORMAT (#24430)

It's loaded and then never used.

---------

Co-authored-by: Giteabot <teabot@gitea.io>

modules/timeutil/language.go

@@ -1,33 +0,0 @@
-// Copyright 2019 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package timeutil
-
-import (
-	"time"
-
-	"code.gitea.io/gitea/modules/setting"
-)
-
-var langTimeFormats = map[string]string{
-	"zh-CN": "2006年01月02日 15时04分05秒",
-	"en-US": time.RFC1123,
-	"lv-LV": "02.01.2006. 15:04:05",
-}
-
-// GetLangTimeFormat represents the default time format for the language
-func GetLangTimeFormat(lang string) string {
-	return langTimeFormats[lang]
-}
-
-// GetTimeFormat represents the
-func GetTimeFormat(lang string) string {
-	if setting.TimeFormat == "" {
-		format := GetLangTimeFormat(lang)
-		if format == "" {
-			format = time.RFC1123
-		}
-		return format
-	}
-	return setting.TimeFormat
-}