Fixed bug in review deletion

When a review was not the latest it would cause a bug on deletion of the
latest. We changed the logic to work with the latest vote versus the previous
to fix this issue. Now all review deletion ensure a consistent latest vote
state.

Removed default values of one from ProposalResult denormalized fields

The original default value of one assumed ProposalResult was being created
when a Review was created which meant a comment and a vote was made. This is
no longer the case from changes after the original change and has caused off
by one errors in the denormalized count.