Bug 18403: Update permissions - borrowers => 1|* becomes borrowers => 'edit_borrowers'

Bug 18403: Update permissions - borrowers => 1|* becomes borrowers => 'edit_borrowers'

Test plan:
Login with a patron that only have the 'edit_borrowers' permission.
You should be able to access patron's information of patrons inside of your group.

Technical note:
Before this patchset the borrowers permission module contains only 1 permission 'edit_borrowers'.
That meant
  borrowers => 1
and
  borrowers => '*'
had the same behavior.
Moreover, now that we have 2 permissions, 'CAN_user_borrowers' is set when all
permissions of 'borrowers' are set.
We need to update the different occurrences of these tests.

Signed-off-by: Signed-off-by: Jon McGowan <jon.mcgowan@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>