Bug 26078: Prevent generating a new transfer from return policy when resolving a...

Bug 26078: Prevent generating a new transfer from return policy when resolving a transfer

To test:
- Have 2+ branches
- Set your default return policy to Item returns to issuing library
- Find an item with holding branch of Branch A
- Set your library to Branch B
- Check item in
- Koha generates a transfer to Branch A. In doing so, it sets the item holding branch to Branch B
- Set your library to Branch A
- Check item in
- Koha generate a transfer to Branch B. In doing so, it sets the item holding branch to Branch A
- Set you library to Branch A
- Check the item in
 . . . Repeat indefinitely.
 Apply patch
 Repeat
 No more loop

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>