Bug 27454: Pass the arrayref

Otherwise you mess with the following hash elements :)

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

members/memberentry.pl

@@ -962,7 +962,7 @@ sub patron_attributes_form {
         my $lib = $av->count ? $av->next->lib : $class;
         push @attribute_loop, {
             class => $class,
-            items => @{$items_by_class{$class}},
+            items => $items_by_class{$class},
             lib   => $lib,
         }
     }