Fixed inability to swipe to undo votes on comments

[ktgd]

PR Creator Checklist

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• You've discussed making your changes with a member of the dev team per contributing rules in the README
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Summary

After voting on a comment, swiping doesn't let you cancel the vote. This fixes that.

Screenshots

N/A

Test Plan

1. Upvote a comment. Repeat the same swipe (upvote) to cancel it. Verify that the vote in undone.
2. Downvote a comment. Repeat the same swipe (downvote) to cancel it. Verify that the vote in undone.