[#32698] Avoid loading tabs-state.js in com_content frontend

tabs-state.js is not currently needed in any of the com_content frontend views. If at some point in the future it does become needed, it should be loaded in the individual views, not in the controller.

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32698