Bug 11229: (followup) makepartialpayment fix

Bug 11229: (followup) makepartialpayment fix

makepartialpayment() wasn't logging the branch either. This patch
fixes that too.

To test:
- Run (with the regression tests applied)
  $ prove t/db_dependent/Accounts.t
=> FAIL: tests fail because makepartialpayment is not logging the branch code
- Apply the patch
- Run
  $ prove t/db_dependent/Accounts.t
=> SUCCESS: tests pass
- Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>