If it's reappearing after cleaning then it's probably a new key that's needed in 1809 and that CCleaner doesn't recognise yet so is clearing by mistake.
I’d just ignore it, it will probably be recognised in the next CC update.
BTW. There is no need to use the registry cleaner unless you are trying to repair a broken/infected machine.
It does not improve performance in the slightest unless the machine IS broken/infected.
Microsoft specifically advise agains using registry cleaners, especially with Windows 10.