I have accidentally tapped on the community wiki button in one of my answers. I want it to be deleted and I will repost the answer. The link to that answer is this
As mentioned in another answer there is no need to delete an answer when you accidentally turned it into CW. Moderators can change it back to a normal post.
All you need to do is get our attention. The best way to do this for things like that is to raise a flag "in need of moderator intervention" on the post and to briefly explain the issue.
Except for unusual circumstances, we will follow the request and revert back the CW.