Sorry I misspoke. I was unable to run the code through my functions.php file, but it seems to be functioning through a snippet plugin:
Code Snippets
My bad.
I’ve been doing a lot of research and I am wondering the same thing. The closest I have found was this:
Allow Participants to Trash / own Topics and Posts
However, that was posted 2 years ago and it seems the code doesn’t work anymore. Ironically, @robin-w it’s your modification xD. Would you mine dropping some insight as to why the code isn’t functioning properly anymore, please. 🙁