Fixed a bug whereby the room id wasn't being passed through to approve_entry_handler.php.   The bug doesn't manifest itself in standard MRBS but does if you're extending auth_book_admin() to make use of the room parameter.

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2798 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7