Bug 19573: Link to make a new list in masthead in OPAC only appears / works if no...

Bug 19573: Link to make a new list in masthead in OPAC only appears / works if no other list already exists

This patch corrects the OPAC masthead include file so that the "New
list" link will appear whether or not the logged-in user has existing
private lists.

To test, apply the patch and log into the OPAC as both a user with
private lists and a user without private lists. The header's "Lists"
dropdown menu should include a "New list" link in both cases.

Signed-off-by: Simon Pouchol <simon.pouchol@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>