Emptry trashbin

A delete on a users trashbin will empty it (the trashbin won't be
deleted of course)

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/files_trashbin/lib/Sabre/TrashHome.php

@@ -44,7 +44,7 @@ class TrashHome implements ICollection {
 	}
 
 	public function delete() {
-		throw new Forbidden('Permission denied to delete your trashbin');
+		\OCA\Files_Trashbin\Trashbin::deleteAll();
 	}
 
 	public function getName(): string {