SAK-6361 Fix helper so it does drop permissions.

This makes sure we always render the <input> tag so that when the permission is inherited we don't lose the permission when saving the realm.

git-svn-id: https://source.sakaiproject.org/svn/authz/branches/SAK-6361@123069 66ffb92e-73f9-0310-93c1-f5514f145a0a