VID-1810 Redo the janky image handling that existed before

AFAICT the v,00000 stuff does nothing.  The videos work either way and the route in the thumbnailer that matches it:

  https://github.com/Wikia/backend/blob/master/lib/Wikia/Thumbnailer.pm#L250

doesn't require it, and just throws away the value it captures.  Cleaning up the cruft ...