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: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit de7349e06af53996d3ae8244bda7f31655340e8a)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>