council_vote.php: fix phpstan warning
council_vote.php: fix phpstan warning

> Variable $votedFor might not be defined.

Rework the logic a bit to make sure static analysis can understand
when the `$votedFor` variable is defined. No functionality changes.

smrealms/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,hemberger/smr