Bug 9380 - branch not recording right on writeoff

Test Plan:
1) Write off fines as various branches
2) Observe the stats lines include the wrong branchcode
3) Apply patch
4) Repeate step 1
5) Observe the stats lines include the correct branchcode

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>

Also tested by changing branch and writing off again - all
tests pass.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Checked individual and complete write off for different branches.
Write offs were always recorded correctly for the logged in branch.
All tests and QA script pas.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Merge branch 'bug_9380' into 3.12-master