Bug 24637: Add brancode in all pay circumstances

Bug 24637: Add brancode in all pay circumstances

To TEST:
1. Have some fines. Pay them using the Pay Amount or Pay Selected buttons.
2. SELECT branchcode FROM accountlines where borrowernumber = '{borrowernumber}';
3. See that branchcode is NULL
4. Apply patch and restart_all
5. Make a partial payment using both the Pay select and Pay amount buttons.
6. SELECT branchcode FROM accountlines where borrowernumber = '{borrowernumber}';
7. Now you should see the branchcodes in the table and no NULL values.

Signed-off-by: Benjamin Daeuber <bdaeuber@fargolibrary.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>