Settings: New implementation for forcing navigation bar [2/2]

Change-Id: Id8bfd96959260db33643dd9bb3fae64df2432405
Revert "Settings: Force show navigation bar (2/2)"

This reverts commit 8b92a2003a937a1ec1b6d5115a8bf4e75a240d5b.

Conflicts:
	src/com/android/settings/cyanogenmod/SystemUiSettings.java

Change-Id: I67f0993e26f1bd3357bc5ce059fe7d8a88e9e3c6