Fix breadcrumbs on custom menu callbacks

There is currently a function that is intended to set the breadcrumb properly on Entity Queue pages: _entityqueue_set_breadcrumb().

However, our current use of it only sets the breadcrumb to "Home » Administration » Structure" and never any further. As we have this function to fix the breadcrumbs, we should have it work when editing a queue's items and include at least the "Entity queues" parent item.