Bug 21015: Remove unecessary 'use Koha::Schema' statements in t/

Bug 21015: Remove unecessary 'use Koha::Schema' statements in t/

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 9fb827d59d0421b1f3e2de36239cef4c7411c666)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 26b9c4abac5795194a48aea017630b54e54f0fe5)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>