Use the real behavior to decide the animation

If the appearance or the behavior are not controlled by APIs,
InsetsController will still return the default values, but the
internal logic will access the real value.

Fix: 192635471
Test: Open an app which hides system bars with
      SYSTEM_UI_FLAG_IMMERSIVE_STICKY, but not
      BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE.
Change-Id: I1c2f947e3707fcb4c151c1ad19c9cd16527e11d9