Bug 34218: Send a record copy to avoid loss of information and display problems

As I wrote in the bug description, I encountered this problem in a particular case,
so I'll explain it in the test plan, but it's certainly likely to be encountered in different ways.

Test plan:

1) Link authorised values with  a field on a MARC framework, like a 942a related to branches
2) Set it on a record with no items
3) Activate syspref "AlternateHoldingsField" and set it to field 942a
4) Go to OPAC View and you will see "Holdings: " without any values
5) Apply this patch
6) Do step 4) again and now it's fixed

Signed-off-by: Sam Lau <samalau@gmail.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

opac/opac-detail.pl

@@ -639,7 +639,7 @@ $variables->{show_analytics_link} = $show_analytics;
 $template->param(
     XSLTBloc => XSLTParse4Display({
         biblionumber   => $biblionumber,
-        record         => $record,
+        record         => $record->clone(),
         xsl_syspref    => 'OPACXSLTDetailsDisplay',
         fix_amps       => 1,
         xslt_variables => $variables,