Bug 31818: Enable table elements in keyboard shortcuts popover

Bug 31818: Enable table elements in keyboard shortcuts popover

This patch updates the whitelist for the popover to ensrue our shortcuts table displays

To test:
1 - Open the advanced cataloging editor
2 - Click 'Keyboard shortcuts'
3 - Is empty, be sad
4 - Apply patch
5 - Reload
6 - Click it again
7 - Shortcuts!

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>