Fix access log (#14475)

Fix #14121, #14478.

The `AccessLog` middleware has to be after `Contexter` or `APIContexter` so that we can get `LoginUserName` if possible.
And also there is a **BREAK** change that it removed internal API access log.

routers/api/v1/api.go

@@ -553,6 +553,11 @@ func Routes() *web.Route {
 		}))
 	}
 	m.Use(context.APIContexter())
+
+	if setting.EnableAccessLog {
+		m.Use(context.AccessLogger())
+	}
+
 	m.Use(context.ToggleAPI(&context.ToggleOptions{
 		SignInRequired: setting.Service.RequireSignInView,
 	}))