Bug 32650: Prevent Koha/Holds.t to fail randomly

Bug 32650: Prevent Koha/Holds.t to fail randomly

22:25:51 koha_1       |     #   Failed test 'Items 1, 2, and 5 are available for filling the holds'
22:25:51 koha_1       |     #   at t/db_dependent/Koha/Holds.t line 531.
22:25:51 koha_1       |     #     Structures begin differing at:
22:25:51 koha_1       |     #          $got->[0] = '1000'
22:25:51 koha_1       |     #     $expected->[0] = '996'
22:25:51 koha_1       |     # Looks like you failed 1 test of 6.
22:25:51 koha_1       |
22:25:51 koha_1       | #   Failed test 'get_items_that_can_fill'
22:25:51 koha_1       | #   at t/db_dependent/Koha/Holds.t line 539.

We need to use a numeric sort, or 1000 is before 996...

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>