Bug 12517 - Download and send list popups broken in bootstrap OPAC

Bug 12517 - Download and send list popups broken in bootstrap OPAC

A JavaScript error prevents the download list and send list links in the
bootstrap OPAC from functioning correctly. A variable declaration was
removed from basket.js during the creation of the theme but
opac-shelves.tt was not changed accordingly. This patch corrects it.

To test, view an existing shelf in the bootstrap OPAC and test the
"download list" and "send list" links. They should each trigger popups
without any errors.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Popups pops again, no koha-qa errors

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>