Bug 38246: Only check unresolved claims

To test:
1. Set up sysprefs:
   - Set any non-empty value for ClaimReturnedLostValue
   - Set AutoClaimReturnStatusOnCheckout to "found in library"
   - Set AutoClaimReturnStatusOnCheckin to "returned by patron"
2. Check out an item to a patron
3. On the patron's account page, click the "Claim Return" button next to
   that checkout
4. Check the item in. Note the message that the claim was auto-resolved.
5. Return to the patron's account page and open the Claims Returned tab
--> Note that the claim is resolved and hidden
6. Click the "Show all 1 claims" link to view the hidden claim. Make a
   note of the resolution code and timestamp.
7. Check the item out again
--> Note the message saying that the claim was resolved, even though it
    was already resolved previously
8. View the return claim again
--> Note that the timestamp and resolution code have changed
9. Apply patch and restart_all
10. Repeat steps 2-8 with a new item
--> Note you do not get a claim resolved message on checkout this time
--> Note that the timestamp and resolution code remain the same before
    and after the checkout

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

circ/circulation.pl

@@ -442,6 +442,7 @@ if (@$barcodes && $op eq 'cud-checkout') {
         my $claims = Koha::Checkouts::ReturnClaims->search(
             {
                 itemnumber => $item->id,
+                resolution => undef,
             }
         );
         if ( $claims->count ) {