Remove unnecassary calls to filepath.Join (#17608)

- Partialy resolvess #17596
- Resolves `badCall` errors from go-critic `badCall: suspicious Join on
1 argument`
- When only 1 argument is passed into `filepath.Join`, it won't do
anything special other than `filepath.Clean(...)` will be applied over
it.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>

routers/web/user/setting/profile.go

@@ -250,7 +250,7 @@ func Repos(ctx *context.Context) {
 		repoNames := make([]string, 0, setting.UI.Admin.UserPagingNum)
 		repos := map[string]*models.Repository{}
 		// We're going to iterate by pagesize.
-		root := filepath.Join(models.UserPath(ctxUser.Name))
+		root := models.UserPath(ctxUser.Name)
 		if err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
 			if err != nil {
 				if os.IsNotExist(err) {