Revert "Settings: don't remove navigation bar prefs when toggling"

This reverts commit 34344a5fa2a03d849901f09340f3dd8010e2a7fe.
Revert "Fix exception being thrown if CMHW is not installed."

This reverts commit c4d2f9c285d79a282cb821e9d4df4a833f8e26c3.
Remove help from rambar

Change-Id: I40f1d7ce6cac30ed8bd80fbaf48723afa00b007c