improve error message when status is `invalid`

[dansmith65]

The logs do show this is the issue, but it doesn't give a very good error message. I'd like to modify this script to better explain why if failed in this case.

detail key provided some helpful info worth extracting in the error message, I think.

Originally posted by @dansmith65 in https://github.com/dansmith65/FileMaker-LetsEncrypt-Win/discussions/23#discussioncomment-10685341