smart cover: show it when closing display while on keyguard

currently if you are on the keyguard and close the smart cover, the display
will turn off.

only turn it off, if we are not on the keyguard.
screen turns off after the default smart cover timeout

Change-Id: I889dd04b2b5223c3f239f41cc3bf097541c0497e
smart cover: reduce space on top

Change-Id: Id0461c07714d9e50a8be8dbefcfe06393fb0317a