Bug 32946: (QA follow-up) Fix "Send cart" form

Bug 32946: (QA follow-up) Fix "Send cart" form

The send cart form is almost identical to the list
'Send list' form and requires the exact same fixes
to look good. This patch achieves the same look for
both forms.

To test:
* Fill your cart in the OPAC
* Open the cart to view contents
* Click on "Send"
* The form shoud look nicely aligned
* Compary to form for sending lists, they should look the same

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>