Bug 20145: Do not insert 0000-00-00 in patron tests (and more)

Bug 20145: Do not insert 0000-00-00 in patron tests (and more)

We should call Koha::Patron->is_expired in CanBookBeIssued instead of
doing the same calculation.

Tests have been adapted to pass with new SQL modes.

We should not need to update the values in DB, we already have
  Bug 14717: Prevent 0000-00-00 dates in patron data (3.21.00.023)

Test plan:
  prove t/db_dependent/Circulation/dateexpiry.t
  prove t/db_dependent/Koha/Patrons.t
must return green

Signed-off-by: Roch D'Amour <roch.damour@inlibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>