Steamdeck clip to mimic the Jsaux Modcase mount

This uses the base of another model, but adjusted to add a small mount for jsaux mod case attachments. I made this one a bit longer than the mod case to use for a clone hero guitar attachment model. I may come back and shorten it so it works with all the mod case attachments, but for now it will work with ones that don't need to mount from the side. I was able to print it just fine on it's side with supports for the mount and a brim.