In OriginalVideoModelTestCase, change hard-coded date
In OriginalVideoModelTestCase, change hard-coded date

blip.tv seems to have decided to bump up the Last-Modified date on the
image by a week for no particular reason.

This makes the OriginalVideoModelTestCase pass again.

pculture/mirocommunity,pculture/mirocommunity,pculture/mirocommunity,pculture/mirocommunity