Gilded Blackstone Top

Gives gilded blackstone a unique top texture based on the blackstone top texture. It fixes the annoying issue of the top of gilded blackstone using the side, so it should clear up any texture OCD anyone has. Other than that no other changes are made. Most of it was not made by me, but rather Meh!#1167 on Discord. I just made a few edits and reuploaded it in his name (with permission, of course).