Disabled ReCaptcha For 2.5 New Installs

See:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=30810

and:
https://github.com/joomla/joomla-cms/pull/1088

For 2.5, there isn't a postgres, so this fixes mySQL and SQLAzure