Removes hardcoded non-breaking space after span element in tags layout

/layouts/joomla/content/tags.php line 25 contains a hardcoded space after the closing span element that is unnecessary and could potentially be problematic in certain implementations. Spacing should be handled by CSS instead.

Joomla tracker item at http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33517&tracker_id=33517