Fix broken menu entries under "Other -> Booking" in patron interface

Fix broken menu entries under "Other -> Booking" in patron interface

This issue was reported to me by Steve Callender.  The menu entries
under "Other -> Booking" had all stopped working.

There's a catalog of URL constants under window.urls sometimes, and
formerly (or other times?) at xulG.urls for XUL-based staff client
interfaces.  There's a new-tab-opening method that needed to be more
flexible when looking for that catalog.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>
Signed-off-by: Bill Erickson <berick@esilibrary.com>