FIX: Hide bootbox after a negative answer (PR #10028)

Starting to reply and then editing a post was not possible because of a bootbox which kept showing up.

GitHub

I don’t think the PR title is correct?

The title of this pull request changed from “FIX: Perform crop using user-specified image sizes” to " FIX: Hide bootbox after a negative answer

Oops, that’s right. I think I choose another branch before I selected the right one and the title stuck somehow. :woman_facepalming: