No don't delete it. It's handy for others in case they have the same/ similar problem.
Unless you really really want it deleted I suppose? I prefer to leave my "daft" threads where I solve it myself, I sometimes go back and repeat the same thing 5 years later, then re-reading the same thread and remember the answer! I am a bit scatty though, If I don't think about it/ use it, I tend to forget it before long.