Bug 11889: (follow-up) Remove share if you are the new owner

This will probably be exceptional. But if the staff member already had
a share for a private list of the patron he deletes now, he will be
the new owner and we should remove the share record.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Cédric Vita <cedric.vita@dracenie.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Koha/Patron.pm

@@ -399,6 +399,8 @@ sub delete {
                 }
                 foreach my $slist ( @sharedlists ) {
                     $slist->set({ owner => $usernumber })->store;
+                    # if staff member had a share, remove it
+                    $slist->remove_share( $usernumber );
                 }
             }