Prevent orientation changes from destroying/recreating security settings

Logic in SecuritySettings deliberately recreates the entire preference
tree in onResume rather than onCreate.  This causes the state to be
lost when the orientation changes.

Instead of destroying/recreating when the orientation changes, handle
it ourselves.

FEIJ-1457
Change-Id: I6276d8f97cb64a4823286f263642926561d7f2d0
(cherry picked from commit d4287ef9)