Keyguard: don't refresh ui when screen off

KeyguardStatusView is doing refresh all the time,
which cause high power when screen off.

PatchSet:
- We turn of the refresh when screen is off which is a good
  idea. But we should force latest next refresh when screen turns
  on. Du that a timechanged refresh maybe comes a bit later.

Change-Id: Ifabdde4419a23e919cd52fe77e78ec3160575af1

Keyguard: fix codestyle

Change-Id: I3f1fbab0ae5434b09766cd69c39a133f4a7039d0