Fixes an opposite value of "deliverable" variable
Fixes an opposite value of "deliverable" variable

It looks like a typo. Otherwise, why is returned an opposite of a `product.is_deliverable`?
diefenbach/django-lfs,wisonwang/django-lfs,leadbrick/django-lfs,leadbrick/django-lfs,pigletto/django-lfs,diefenbach/django-lfs,pigletto/django-lfs,leadbrick/django-lfs,diefenbach/django-lfs,wisonwang/django-lfs,pigletto/django-lfs,wisonwang/django-lfs