Bug 25498: Transfer ownership shared list on OPAC

Bug 25498: Transfer ownership shared list on OPAC

Test plan:
Pick or create a shared list. Login as owner.
Transfer to one of the other members.
Verify that you do no longer have Transfer, but see Remove share.
Login as the other member. Transfer it back.

Bonus: Working with two tabs, you can open the Transfer form and
in the meantime delete the list, the patron or remove the share.
Or change permissions. Submit after that and check the error message.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>