Revert "Keyguard: don't refresh ui when screen off"

This reverts commit ad4d5df99023cede487a7fe8d9a55408987bc21a.
Revert "onAccountsUpdated shouldn't be called back after listener unregistered"

This reverts commit 4ae31dbb3e56f7b34d2865746bee35e54dba0e2d.
Revert "Fix to NullPointerException when activity is relaunched"

This reverts commit d221c48217ae8baf3a75116a77346f68afd1fa4e.