Bug 16819: C4::Members::DelMember should use Koha::Holds to delete holds

Bug 16819: C4::Members::DelMember should use Koha::Holds to delete holds

This patch makes C4::Members::DelMember proprely use Koha::Holds to delete
holds. This is important as holds actions are started to be logged.

To reproduce:
- Apply the patch
- Run:
  $ prove t/db_dependent/Members.t
=> SUCCESS: Tests pass
- Sign off :-D

Sponsored-by: NEKLS
Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
All tests pass successfully

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>