Bug 24777: Use patron.is_debarred instead of patron.debarred in return.tt

Bug 24777: Use patron.is_debarred instead of patron.debarred in return.tt

In return page return.tt, when there is an hold message, patron is said as restricted even if restriction end date is in the past.

Test plan :
1) For a patron Jon Doe create a manual restriction with end date in the past
2) Create an hold for this patron on an item
3) Check in this item => You don't see message "Patron is RESTRICTED"
4) For a patron Kevin Doe create a manual restriction with end date in the future
5) Create an hold for this patron on an item
6) Check in this item => You see message "Patron is RESTRICTED"
7) Repeate 1-6 with system preference HoldsAutoFill enabled
8) Repeate 1-6 with a waiting hold

Signed-off-by: Nazlı Çetin <nazli@devinim.com.tr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>