Fixed sortBy throwing exception on closure call (#225) (#226)

skipping the built in sorting when passing a closure to sortBy

src/Lavary/Menu/Builder.php

@@ -473,6 +473,7 @@ public function sortBy($sort_by, $sort_type = 'asc')
             }
 
             $this->items = new Collection($rslt);
+            return $this;
         }
 
         // running the sort proccess on the sortable items