Fetch vote count data only when vote counts are being displayed for specific poll

[mice-sk]

Do not fetch vote count data if currently rendered poll does not display them.

At the moment, this applies only when showing vote results to a user who already voted:
eb2e360#L0R203

If we implement visible vote counts to users who did not vote yet, same measure should apply (i.e. prepare vote result data only if poll that is being rendered is set to display vote data to users).

[teo-sk]

This should depend on #12