Bug 20516: Show patron's library in pending discharges table

Bug 20516: Show patron's library in pending discharges table

Test plan:
1. Enable syspref useDischarge
2. Login to OPAC and ask for a discharge (tab on the left)
3. Login to intranet, you should see a message about pending discharges,
   and a link. Click on the link.
4. Confirm that there is a 'Library' column in the table that is
   displaying the patron's library

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>