Bug 27534: Add missing ON UPDATE/DELETE clause to message_transport_type_fk

Bug 27534: Add missing ON UPDATE/DELETE clause to message_transport_type_fk

Bug 9016 (3.15.00.039) added message_transport_type_fk but the ON DELETE
CASCADE ON UPDATE CASCADE clause was missing from the updatedatabase
entry.
If we are upgrading from an old version, 20.06.00.058 will fail on
updating the message_transport_type, with
"Cannot delete or update a parent row: a foreign key constraint fails".

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