[#33441] fix FinderModelSearch::populateState() missing input filters

Fixing issue described in [bug #33441](http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_id=8103&tracker_item_id=33441), related to missing input filter parameters in FinderModelSearch::populateState (components/com_finder/models/search.php)