Aurelia output: disabling "restore dim level from memory" should restore the previous configured startup dim level #2656
Description
The Aurelia SwitchingOutput dbus item Settings/StartupDimming, can be written with a value 0..100 to set the dim level at startup.
By setting the dbus item to -1, the last dimlevel is restore on startup.
Extend the interface to also allow writing the value -2, which will clear "Restore dim level from memory" setting, restoring the previously configured startup dimlevel.