Bug 24471: Rename handle_commit_maybe method

Bug 24471: Rename handle_commit_maybe method

To test (k-t-d):
1) Enable ILLModule and install FreeForm, run:
  bash <(curl -s https://raw.githubusercontent.com/ammopt/koha-ill-dev/master/start-ill-dev.sh)
2) Checkout 24.05.x branch, run:
  cd /kohadevbox/koha/Koha/Illbackends/FreeForm
  git checkout 24.05.x
3) Create a new ILL request from:
  http://localhost:8081/cgi-bin/koha/ill/ill-requests.pl
4) Confirm the request creation works as before

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>