forgot a variable for NavBar-Height Fix

Change-Id: Ifb09eccdb7cf9551f8170f538ccfe834b26bb920

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
Remove duplicate NAV_BUTTONS_HEIGHT definition

Change-Id: Ieadf6e14429247381a1d312ed71d855a9bbd2432