Workaround for interrupting expired files deletion

Workaround avoiding "Error while running background job (class: OCA\Files_Trashbin\BackgroundJob\ExpireTrash, arguments: ): {"Exception":"OCP\\Files\\NotPermittedException","Message":"","Code":0,"Trace":"#0 \/var\/www\/cloud\/apps\/files_trashbin\/lib\/Trashbin.php(590): OC\\Files\\Node\\File->delete() [...]"