This task was added in commit 2b9b78e38. According to the notes in the
pull request introducing the change:
> If you have had [map validations] in production, you might want to run
> the rake task votes:reset_vote_counter to reset the cached votes
> counter. Otherwise, until there is another vote for a proposal, the
> counter will not be updated, and there might be some votes which are
> not yet displayed
In short, this was a task that was introduced for a specific release and
had to be run manually. So we can remove it now.
f15f250150