don't backtick quote stuff

server/ctrlsubsonic/handlers_by_folder.go

@@ -160,7 +160,7 @@ func (c *Controller) ServeGetAlbumList(r *http.Request) *spec.Response {
 		q = q.Joins("JOIN album_stars ON albums.id=album_stars.album_id AND album_stars.user_id=?", user.ID)
 		q = q.Order("right_path")
 	default:
-		return spec.NewError(10, "unknown value `%s` for parameter 'type'", v)
+		return spec.NewError(10, "unknown value %q for parameter 'type'", v)
 	}
 
 	if m := getMusicFolder(c.musicPaths, params); m != "" {