Don't show dnd suppressed icons on aod

The aod icons are from the shelf. When DND is suppressing
status bar icons and aod is on (mFullyDark), still don't show
the icons that would show on AOD (if DND wasn't on).

Test: manual
Test: atest NotificationIconAreaControllerTest
Fixes: 122636236
Change-Id: I4680ea1c88427207274da48a6ab69f0c00a3ac69