Bug 19055: Remove C4::Reserves::GetReservesToBranch

Bug 19055: Remove C4::Reserves::GetReservesToBranch

This subroutine is no longer in used and can be removed

Test plan:
  git grep GetReservesToBranch
must not return any results

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 9cc7268362219e39b22aebb03a83e013f467d93a)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 319f5f67aaa056952ecc9a4500fa52627db4fdcc)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>