Bug 36241: Update missing query_type => op in ill-batch.inc

Bug 36241: Update missing query_type => op in ill-batch.inc

Test plan:
- Add 'FreeForm' backend and enable ILLModule, run:
bash <(curl -s https://raw.githubusercontent.com/ammopt/koha-ill-dev/master/start-ill-dev.sh)
- Install a metadata enrichment plugin, e.g.:
https://github.com/PTFS-Europe/koha-plugin-api-pubmed/releases
- Add 5 batches, run the following command in kshell:
for x in {1..5}; do echo "INSERT INTO illbatches (name, backend, library_id, status_code, patron_id) VALUES ('$x', 'FreeForm', 'CPL', 'NEW', 52);"; done | koha-mysql kohadev
- Visit ILL batches page:
<INTRA_URL>/cgi-bin/koha/ill/ill-requests.pl?method=batch_list
- Confirm no batches are shown. Apply patch. Repeat.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>