Floating IME or fullscreen IME won't cause insets (except the area
overlapped with navigation bar). It doesn't make much sense to let
apps move the IME at these cases.
Fix: 157777145
Test: atest InsetsSourceConsumerTest GlobalActionsImeTest
ImeInsetsControllerTest
Change-Id: Id70f59be7653beedc02d6c8bc3b1bd50a357f4fe