Bug 13950: Sort Item search home library list by branch name

Bug 13950: Sort Item search home library list by branch name

On the item search form the list of home libraries isn't sorted
alphabetically by their descrption.

To test:
- Ensure that you have libraries whose code/name are sorted in a different alphabetical order (e.g. Aardvark/ZZZ & Zebra/AAA)
- Staff: Advanced search - item search
- See that libraries are sorted in code order
- Apply patch
- Verify selection block for home library is correctly sorted after
  applying the patch.

Signed-off-by: Indranil Das Gupta (L2C2 Technologies) <indradg@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 958be9804a50c3e13f74c4d5f81348e2256a8042)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>