cLock: Enable up navigation

When the user enters cLock preferences through settings:
* Up navigation is enabled
* 'Done' icon on actionbar is hidden

When the user enters cLock preferences by adding a new widget:
* Up navigation is enabled in submenus
* 'Done' icon is only visible on top preferences menu

Change-Id: I3029618e0d158d766578568989f2e535593d0f41