Revert "Navigation Bar height setting [1/2]"

This reverts commit 867ce9c37531a608793fc0e2329888a015e5831f.

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/layout-ldrtl/navigation_bar.xml
	packages/SystemUI/res/layout/navigation_bar.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java