Bug 32662: Use template wrapper for item circulation alerts page

Bug 32662: Use template wrapper for item circulation alerts page

This patch implements the template WRAPPER system (see Bug 32571)
for building tabs on the item circulation alerts page.

To test, apply the patch and go to Administration -> Item
circulation alerts. There should be two tabs, "Checkout" and
"Check-in" which work correctly.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>