Bug 12134: ensure that patrons are not restricted even when the last restriction...

Bug 12134: ensure that patrons are not restricted even when the last restriction has expired

Test Plan:
1) Add a manual restriction to a patron and wait until the
   expiration date of the restriction has passed.  This can be
   simulated by modifying borrowers.debarred for a borrower and
   setting the date in the past.
2) Try to check out an item to that patron
3) Note you cannot
4) Apply this patch
5) Repeat step 2
6) Note you can now check out items the patron

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>