Make Air Assist configurable on Ruida devices

[TheAssassin]

The Ruida driver always sends the Air Assist enable command at the moment. While this is probably fine for the majority of all use cases, I'd like to make it configurable. It's a very low priority, but it turned out to be handy to just disable this while debugging a new Ruida device because it saves a few seconds.

[TheAssassin]

Looks like at least for my Ruida device, the Air Assist blower (yes, it's basically a blower fan) is always turned on no matter what. Removing the according command in the driver does not change its behavior, neither does adding the "off" command. So at least for me, this is not relevant any more. (It might be for other people, though.)