Bug 28641: ILLHiddenRequestStatuses does not consider custom statuses

This patch adds the status_alias column to the ILLHiddenRequestStatuses sys pref check.
Because requests will have status_alias NULL by default, we also check for that.

Test plan:
Create multiple ILL requests of different backends and place them in different status (NEW, COMP, REQ, etc)
Create multiple ILLSTATUS entries
Add and remove a mix of both status and status_alias codes in ILLHiddenRequestStatuses and refresh the ILL requests page to confirm the result is according to expectation.

Sponsored-by: PTFS Europe

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Koha/REST/V1/Illrequests.pm

@@ -64,7 +64,15 @@ sub list {
     # If necessary, only get those from a specified patron
     my @requests = Koha::Illrequests->search({
         $hidden_statuses
-        ? ( status => { 'not in' => $hidden_statuses } )
+        ? (
+            -and => {
+                status => { 'not in' => $hidden_statuses },
+                status_alias => [ -or =>
+                    { 'not in' => $hidden_statuses },
+                    { '=' => undef }
+                ]
+            }
+        )
         : (),
         $args->{borrowernumber}
         ? ( borrowernumber => $args->{borrowernumber} )