Bug 30886: Show pending recall on item on OPAC

Bug 30886: Show pending recall on item on OPAC

The 'completed' flag was causing the wrong status to be shown, but we
can also give a more useful message to the patron.

To test:
1) Enable the UseRecalls system preference and set up your
recalls-related circulation rules.
2) Check out an item to Patron B.
3) Log into the OPAC as Patron A and search for the item.
4) Place a recall on that item.
5) Go back to the staff client and check the item in. Confirm the recall
as waiting for Patron A.
6) Go back to the OPAC record page and look at the holdings table.
Notice the status still says the item is Available.
7) Apply patch, restart services, refresh the OPAC.
8) Confirm the holdings table status now says the item has a pending
recall.

Sponsored-by: Catalyst IT
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>