[display] Ignore unblank D-Bus requests when p-sensor state is unknown
[display] Ignore unblank D-Bus requests when p-sensor state is unknown

Rejecting display state requests received over D-Bus when sensor is in
CLOSED state allows unblanking the sensor state is unknown.

Reject D-Bus request unless the sensor is in OPEN state.

Signed-off-by: Simo Piiroinen <6d5e5360bed3d486f7d9fb26b0f737f7d4fd45ee@jollamobile.com>

spiiroin/mce,spiiroin/mce,spiiroin/mce,spiiroin/mce