Reset the time limit to 30 seconds every time we delete a child. Fixe…

…s ticket #1199.

modules/gallery/libraries/ORM_MPTT.php

@@ -92,6 +92,7 @@ public function delete($ignored_id=null) {
         // Deleting children affects the MPTT tree, so we have to reload each child before we
         // delete it so that we have current left_ptr/right_ptr pointers.  This is inefficient.
         // @todo load each child once, not twice.
+        set_time_limit(30);
         $item->reload()->delete();
       }