Fix bug and typo in stat cat editor

Fix bug and typo in stat cat editor

Specifically, disabling the ability to select a stat cat type on no permissions on current type.

If you don't have permissions on ASSET you could never get to ACTOR.

If you picked ACTOR without rights you couldn't get back to ASSET.

Also, re-enable the library selector and new buttons when you do change to one you can add for.

Author: Thomas Berezansky <tsbere@mvlc.org>
Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>
Signed-off-by: Jason Etheridge <jason@esilibrary.com>
git-svn-id: svn://svn.open-ils.org/ILS/trunk@20371 dcc99617-32d9-48b4-a31d-7c20da2025e4