Bug 25261: (QA follow-up) Add handling to SCI

Bug 25261: (QA follow-up) Add handling to SCI

Test plan
1/ Enable the feature as per previous patches
2/ Attempt to return an item with materials attached via the SCI
3/ Note that the return is blocked with the message '(The item
cannot be returned at a self service terminal, please see library
staff for assistance)'
4/ Signoff

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