Bug 6536: QA Follow-up for fixing a unit test under Perl 5.18

Bug 6536: QA Follow-up for fixing a unit test under Perl 5.18

The last test on the first series, fails randomly on Perl 5.18:
    not ok 12 - Third query makes no difference
    #   Failed test 'Third query makes no difference'
    #   at t/db_dependent/Breeding.t line 104.
    #          got: ''
    #     expected: '1'
    # Looks like you failed 1 test of 12.
not ok 1 - _build_query

This change makes tests pass. Please consider if this needs to be fixed
(i.e. sort order matters) or the test needs to be rewritten.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
I agree with adding the sort. (The need for doing this in Perl 5.18 is another
topic.)

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>