Bug 35096: Fix batch accessor in ILL request page

Bug 35096: Fix batch accessor in ILL request page

Test plan, k-t-d:
1) Install FreeForm and enable ILLmodule, run:
bash <(curl -s https://raw.githubusercontent.com/ammopt/koha-ill-dev/master/start-ill-dev.sh)
2) Install an ILL availability plugin (e.g. pubmed):
https://github.com/PTFS-Europe/koha-plugin-api-pubmed/releases/tag/1.1.1
3) restart plack:
koha-plack --restart kohadev
4) Create a new ILL batch, visit:
/cgi-bin/koha/ill/ill-requests.pl
5) Click '+New ILL requests batch'
6) Input a name, '42' on the cardnumber and pick a library. Click 'Continue'.
7) On the identifiers textarea, insert '123' and click 'Process identifiers'
8) After the metadata has been retrieved, click the bottom 'Add items to batch' button, click 'Finish and view batch'
9) You should now be seeing 'View ILL requests for batch <batch_name>' with the request you just added.
10) Click the request id (or the 'Manage request' button)
11) Notice you can view the request correctly, the batch it belongs to shows correctly and is clickable

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>