Make settings themed apps have light nav DO NOT MERGE

This is needed to help with differential aging.

The nav needs to be white with a 1dp divider on it, so add support
for the divider and add hidden attribute to set the nav buttons
inverted.

Change-Id: I4a5329f7486a6774ca4de8362caebbe8ba421aad
Test: Open settings
Bug: 63630024