Bug 34843: Fix database comment inconsistency on toc_request

Bug 34843: Fix database comment inconsistency on toc_request

Bug 29093 had a dbrev without comment, but added comment to
kohastructure.

Test plan:
Check (or remove) comment on article_requests.toc_request.
Run dbrev.
Check if comment was added (if you removed).
Run t/db/Koha/Database/Commenter.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>