Fix failure to update fave/boost flags on boosts.

Fix failure to update fave/boost flags on boosts.

When you faved/unfaved or boosted/unboosted a status that you yourself
saw via a boost, the actual operation was happening successfully, and
the updated version of the _boosted_ status was going into our
Client's cache - but re-retrieving the _boost itself_ didn't include
the updated copy of the contained original post.