Use the Storm File model's getLocalRootPath() implementation

This override is no longer required as of c62ee79d7d

modules/system/models/File.php

@@ -2,7 +2,6 @@
 
 use Url;
 use Config;
-use File as FileHelper;
 use Storage;
 use Winter\Storm\Database\Attach\File as FileBase;
 use Backend\Controllers\Files;
@@ -58,14 +57,6 @@ class File extends FileBase
         return $url;
     }
 
-    /**
-     * If working with local storage, determine the absolute local path.
-     */
-    protected function getLocalRootPath()
-    {
-        return Config::get('filesystems.disks.local.root', storage_path('app'));
-    }
-
     /**
      * Define the public address for the storage path.
      */