Keyguard: do not show maximized on simpin and several fixes

- to show a maximzed widget container on first boot when simpin
  or puk is requested does not make any sense. In this case
  show it as normal view
- fix sometimes unresponsive unlock handle on maximized widgets
  and bring it to front (happened only in combination with
  lock before unlock)
- a bit codecleanup and centralize
- fix animation was visible on screnn turn on. Now it is directly
  maximized visible

Change-Id: I9ba5d8f9537c68d3590826eb8d1483a02cfe3266