Bug 36245: Remove cud- from op

1) Install FreeForm, enable ILL module, run:
bash <(curl -s https://raw.githubusercontent.com/ammopt/koha-ill-dev/master/start-ill-dev.sh)
2) You'll have to switch the FreeForm branch to the one compatible with this work, i.e.:
cd /kohadevbox/koha/Koha/Illbackends/FreeForm
git checkout b_36243
3) Restart plack:
koha-plack --restart kohadev
4) Create a new FreeForm request, visit:
<staff_url>/cgi-bin/koha/ill/ill-requests.pl?method=create&backend=FreeForm
5) Set 'type' enter '42' in cardnumber and pick a library. Click 'Create'.
6) Edit that request, click "manage request" or if #1 visit:
<staff_url>/cgi-bin/koha/ill/ill-requests.pl?op=illview&illrequest_id=1
7) Click "Edit item metadata". Click "Submit". Notice it explodes.
9) Apply patch. Restart plack.
10) Repeat 7)

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

ill/ill-requests.pl

@@ -444,6 +444,7 @@ if ( $backends_available ) {
     } elsif ( $op eq "batch_create" ) {
         # Do not remove, it prevents us falling through to the 'else'
     } else {
+        $op =~ s/^cud-//;
         my $request = Koha::Illrequests->find($params->{illrequest_id});
         my $backend_result = $request->custom_capability($op, $params);
         $template->param(