Re-initialize error after attach

If flag for error after attach is not reinitialized, it may cause
NullPointerException on subsequent onAttachedWindow if error text
was reset to null.

Change-Id: I8976c28a6ca71017e5c4b3f29d4eeeb2eda48c38
Keyguard: smooth background change derp fixes

no idea how this could happened. Cleanup, fixes and updates (thanks kyril)

Change-Id: I0296a1d0d7df3dc68c2fde34584ed8c46eef57f3