Fix SystemUI FC after disabling navbar and unlocking the phone

to replicate: boot with navbar enabled, then disable navbar, then switch
the screen off, then unlock with fingeprint or power button

java.lang.IllegalArgumentException: View=com.android.systemui.statusbar.phone.NavigationBarFrame{e0f4d97 G.E...... ......ID 0,0-1080,129 #7f0a01c4 app:id/navigation_bar_frame} not attached to window manager

Change-Id: I5ae631c129af28615d26754848915e351970e422