This question was originally a poll. I said I would VTC if it weren't fixed, gave it a day, voted to close, and then the poster fixed it. Is there a way to remove my vote to close now that it's been fixed?
There's no need to do that. As long as the question no longer meets close criteria other people won't vote to close it and the vote to close will harmlessly expire shortly. If it is already closed, vote to re-open it.
I additionally found out that you can retract a close vote if you do it within I think an hour of casting it. But it must be like the five-minute edit window on comments — you only have so long to do it, and then the system locks you out.