Use current user Context to generate NavBar layout

When generating Navigation bar LayoutParams, NavBar should use the
Context with the current user, or it still layout as primary user's
navBar mode even if users changes nav bar mode on the device with
secondary user.

fixes: 230707589
Test: manual - see reproducible video in b/230707589#comment2
Test: atest navigationBarTest

Change-Id: I71e66501a378490a80189299607a6bab916cb985