keyboard: Forward on the super key if pressed by itself
If the super key is the only key pressed (so it isn't used as a modifier) we want to pass the event onto Phosh. This handles the complex logic of looking for the key being pressed and released in Phoc allowing Phosh to just easily react to the event.
Fixes: phosh#563 (closed) Signed-off-by: Alistair Francis alistair@alistair23.me