Bug 17852 Follow up.Multiple URLs (856) in list email are broken

Bug 17852 Follow up.Multiple URLs (856) in list email are broken

This is a follow-up to my previous patch. This fixes it on the OPAC and
the previous one was from the intranet
Test Plan
1: Add multiple urls to a biblographic record
2: Add the biblographic record to a list and then email it from the OPAC
3: See that the links are broken and have been merged into one.
4: Apply patch
5: Send the list again and see that the links work

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Mason James <mtj@kohaaloha.com>
(cherry picked from commit e914a29788a1a85399a135d3cfd19ef9ee6f5a28)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>