Bug 15628: Remove get_branchinfos_of vestiges

 Bug 15628: Remove get_branchinfos_of vestiges

The C4::Branch::get_branchinfos_of subroutine has been removed by bug
7034, but 2 occurrences have been left

git grep get_branchinfos_of
C4/Branch.pm:           &get_branchinfos_of
t/db_dependent/Branch.t:      get_branchinfos_of

Test plan:
  git grep get_branchinfos_of
should not return any occurrences.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Vestiges removed

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>