SystemUI: set fingerprint auth properly after occluded change

After an incoming call the screen may get set to occluded. The flags
in the current logic were revsered (turning fingerprint auth ON when
occluded, which is wrong). Also it never sent the message to the
handler.

Ref: CYNGNOS-1103

Change-Id: Id90c958a0387a8ff458796bc97075727d89bb85e
Signed-off-by: Roman Birg <roman@cyngn.com>