Correct the access log format (#24085)

The default access log format has been unnecessarily escaped, leading to
spurious backslashes appearing in log lines.

Additionally, the `RemoteAddr` field includes the port, which breaks
most log parsers attempting to process it. I've added a call to
`net.SplitHostPort()` attempting to isolate the address alone, with a
fallback to the original address if it errs.

Signed-off-by: Gary Moon <gary@garymoon.net>

docs/content/doc/administration/config-cheat-sheet.en-us.md

@@ -878,7 +878,7 @@ Default templates for project boards:
 
 - `ENABLE_ACCESS_LOG`: **false**: Creates an access.log in NCSA common log format, or as per the following template
 - `ACCESS`: **file**: Logging mode for the access logger, use a comma to separate values. Configure each mode in per mode log subsections `\[log.modename.access\]`. By default the file mode will log to `$ROOT_PATH/access.log`. (If you set this to `,` it will log to the default Gitea logger.)
-- `ACCESS_LOG_TEMPLATE`: **`{{.Ctx.RemoteAddr}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}\" \"{{.Ctx.Req.UserAgent}}"`**: Sets the template used to create the access log.
+- `ACCESS_LOG_TEMPLATE`: **`{{.Ctx.RemoteHost}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}" "{{.Ctx.Req.UserAgent}}"`**: Sets the template used to create the access log.
   - The following variables are available:
   - `Ctx`: the `context.Context` of the request.
   - `Identity`: the SignedUserName or `"-"` if not logged in.

docs/content/doc/administration/config-cheat-sheet.zh-cn.md

@@ -265,7 +265,7 @@ test01.xls: application/vnd.ms-excel; charset=binary
 - `LEVEL`: 日志级别，默认为 `Trace`。
 - `DISABLE_ROUTER_LOG`: 关闭日志中的路由日志。
 - `ENABLE_ACCESS_LOG`: 是否开启 Access Log, 默认为 false。
-- `ACCESS_LOG_TEMPLATE`: `access.log` 输出内容的模板，默认模板：**`{{.Ctx.RemoteAddr}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}\" \"{{.Ctx.Req.UserAgent}}"`**
+- `ACCESS_LOG_TEMPLATE`: `access.log` 输出内容的模板，默认模板：**`{{.Ctx.RemoteHost}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}" "{{.Ctx.Req.UserAgent}}"`**
   模板支持以下参数:
   - `Ctx`: 请求上下文。
   - `Identity`: 登录用户名，默认: “`-`”。

docs/content/doc/administration/logging-documentation.en-us.md

@@ -304,7 +304,7 @@ log using the value: `ACCESS = ,`
 
 This value represent a go template. It's default value is:
 
-`{{.Ctx.RemoteAddr}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}\" \"{{.Ctx.Req.UserAgent}}"`
+`{{.Ctx.RemoteHost}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.URL.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}" "{{.Ctx.Req.UserAgent}}"`
 
 The template is passed following options: