Bug 24457: Make overloaded ->to_api pass the params to parent method

Bug 24457: Make overloaded ->to_api pass the params to parent method

This patch makes the overloaded to_api method for baskets care about the
remaining parameters, and pass them to SUPER::to_api.

To test:
1. Apply the regression tests
2. Run:
   $ kshell
  k$ prove t/db_dependent/Koha/Acquisition/Basket.t
=> FAIL: Tests fail! No embedded bookseller!
3. Apply this patch
4. Repeat 2
=> SUCCESS: Tests pass!
5. Sign off :-D

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