Bug 34013: Recalls awaiting pickup doesn't show count on each tab

Bug 34013: Recalls awaiting pickup doesn't show count on each tab

This patch modifies recalls_waiting.pl so that it defines template
variables for 'recalls waiting' and 'recalls waiting over x days'
counts in the same way that waitingreserves.pl handles it.

To test you must have UseRecalls enabled, and some recalls data that
will allow you to see content under each tab.

Go to Circulation -> Recalls awaiting pickup and confirm that both tabs
show the correct count.

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>