Replaced left-over deprecated paginate() through Paginator->paginate()

https://github.com/cakephp/cakephp/blob/master/lib/Cake/Controller/Controller.php#L1071

According to @burzum this should have been fixed in the develop branch:
https://github.com/CakeDC/search/pull/82#issuecomment-20945858

But as it seems there was some leftovers ;-)