Bug 22421: (follow-up) Fix tests

Need to search by old_issue_id instead of issue_id when checking the
value of an accountline after calling AddReturn on the linked checkout

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

t/db_dependent/Circulation.t

@@ -3701,7 +3701,7 @@ subtest 'AddReturn | is_overdue' => sub {
         $lines = Koha::Account::Lines->search(
             {
                 borrowernumber => $patron->borrowernumber,
-                issue_id       => $issue->id
+                old_issue_id   => $issue->id
             }
         );
         $accountline = $lines->next;