Bugfix: set pre-existing address on cart
Bugfix: set pre-existing address on cart

Before this change, the form did not associate the address with the cart if an
identical address already existed.

nimbis/django-shop,nimbis/django-shop,khchine5/django-shop,divio/django-shop,jrief/django-shop,jrief/django-shop,khchine5/django-shop,jrief/django-shop,khchine5/django-shop,divio/django-shop,awesto/django-shop,awesto/django-shop,nimbis/django-shop,khchine5/django-shop,jrief/django-shop,nimbis/django-shop,divio/django-shop,awesto/django-shop