Process insets correctly

Bottom window insets were being processed but keyboard was being
ignored. Paddings should also only be applied on the correct
lifecycle event.

Fixes: 132615062
Test: swipe up to unlock with: pin/pattern/password
Test: swipe up to unlock with: 2 button navbar, gestural navbar
Change-Id: Ib573e20d9955e644f60333ad3d8e0f2d7e73fe54