Bug 24776: Remove Borrowers.HasOverdues call

Bug 24776: Remove Borrowers.HasOverdues call

Borrowers Template Toolkit plugin contains method HasOverdues that can be directly called from Koha::Patron object.

Test plan :
1) Go to circulation page of a patron with overdues
2) Click on print button
3) You see "Print overdues"
4) Go to circulation page of a patron without overdues
5) Click on print button
6) You don't see "Print overdues"

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>