lid: track the notifier initial state internally, but not externally

lid: track the notifier initial state internally, but not externally

What we do not want is libinput to believe the LID is closed while
it's not. But the internal notifier state need to be in sync with the evdev
node, or it's going to be a pain setting the keyboard listener.

But since we don't know if the state is reliable, we track the internal state
separately from the external state so that we can set up the keyboard listener
when the lid is closed, without having libinput actually send lid closed
events for unreliable devices.

https://bugs.freedesktop.org/show_bug.cgi?id=101099

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>