Bug 22970: Allow to change homebranch in batch add course reserves

Bug 22970: Allow to change homebranch in batch add course reserves

Test plan:
1. Create a course (disabled)
2. Add multiple reserves to this course using 'batch add' and set
   a homebranch different from the items homebranch
3. Enable the course
4. Verify that the items homebranch have changed
5. Disable the course
6. Verify that the items homebranch were reset to their initial value

Depends on bug 22630

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>