Bug 33971: Remove x-koha-query usage in biblios.t

Bug 33971: Remove x-koha-query usage in biblios.t

This patch removes handling of x-koha-query from the tests.

To test:
1. Run:
   $ ktd --shell
  k$ prove t/db_dependent/api/v1/biblios.t
=> SUCCESS: Tests pass
2. Apply this patch
3. Repeat 1
=> SUCCESS: Tests still pass! Change from x-koha-header to q= gives same
results.
4. Sign off :-D

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>