Bug 9073 - Download option from the cart should match the menu button in lists

Bug 9073 - Download option from the cart should match the menu button in lists

This patch moves the staff client Cart download choices into a toolbar
menu button instead of requiring that the user make the choice via a form
in the pop-up window.

To test, add items to Cart in the staff client. Open the cart and
choose a download option from the Download menu. Your download
should complete correctly without the page changing or reloading.

Unrelated edit: Eliminating duplicate document.ready() block by
consolidating a couple of lines of JavaScript.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Checked all export formats can be selected and downloaded, including
CSV profiles.
All tests and perlcritic pass.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>