Shows the correct home icon when quickstep is enabled on startup

The wrong home icon was shown on startup because it takes sometime for
the disabled flags to set disable recents flag that determines if
overview is enabled. When it changes to be true update nav bar icons.

Test: boot phone and look at nav bar
Change-Id: Ib1c00cfa1c3eb0444ccc985dfaf1b3c74e790692
Fixes: 74071465