Bug 31785: (follow-up) Fix modify operation too

Bug 31785: (follow-up) Fix modify operation too

Test plan:
Enable SQL strict mode (koha-conf).
Modify branch, set Public to No.
Check.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 0d974073db9311336ddb6bcdf82eb980953983a8)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 679f9942c79cbac84ccf72a410c8c925e5ddc1ff)
Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>