Bug 12430: Fix Search.t failure

Bug 12430: Fix Search.t failure

t/db_dependent/Search.t ..
    #   Failed test 'buildQuery should keep 0 value'
    #   at t/db_dependent/Search.t line 669.
    #          got: 'su,phr=(rk=(0)) '
    #     expected: 'su,phr=0(rk=(0)) '

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit a37ba7903d6e7c18b2e2f8d9e145936b0dc8b938)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit f7b4f0bccb4f1dade0956754886a090eaec0e42c)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>