Bug 37365: (QA follow-up) Add borrowernumber to referrer url

Since we post to add_message, we need to ensure that the
borrowernumber is added to the referrer url. This 'tric' is
already done there for another form.

Test plan:
See original plan.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit fbc2e2e933)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

circ/add_message.pl

@@ -97,7 +97,7 @@ if ( $op eq 'cud-edit_message' && $message_id ) {
 
 my $url = $input->referer;
 if ($url) {
-    if ( $url =~ m|circulation\.pl$| ) {
+    if ( $url =~ m/(circulation\.pl|members\/files\.pl)$/ ) {
 
         # Trick for POST form from batch checkouts
         $url .= "?borrowernumber=$borrowernumber";