In XProfile admin, replace admin.php links with users.php. Fixes regression from 1.6 when profile fields were moved out of Settings and into Users, causing the "Profile Fields" menu item to not appear currently selected. See #5094.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7271 cdf35c40-ae34-48e0-9cc9-0c9da1808c22