Remove cart from certain views

[dgoerger]

Let's remove the cart from all the views where it isn't necessary. The original issue was for the New Reservation/Request page, but we should also remove it from the reservation index page at a minimum. Step one should be listing all of the views that include the cart layout so we can decide which ones to change.

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from #751:

My Cart box should not be visible on Make Reservations page. I can edit the duration of the checkout in this box, but such edit will not be reflected unless "Make Reservations" button is pressed again.

If there are errors in creating the reservation, we already direct the patron to bop back to the catalogue to fix it, so we could probably get away with not having the cart on the new reservation/request pages.

This is also related to #237.

[orenyk]

This should be straightforward and is a pretty bad UX issue, adding to v4.1.