Bug 16340: JS variable in opac-bottom.inc is declared two times

Bug 16340: JS variable in opac-bottom.inc is declared two times

MSG_NO_RECORD_SELECTED declared two times

To test: Go to cart and list (virtual shelves) in OPAC and
verify if those pages work as expected

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit c01bb7dfca65bfbc26197a3039988ba775eb4e79)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>