Don't return half folded state when display in transition

When unfolding device, device returns true for tabletop for a split
second. Tabletop has different default letterbox position multiplier
(top). When device is fully unfolded, tabletop position is false and
if position multiplier returns bottom/middle, app will flicker from top
to final position.

Flag: EXEMPT bugfix
Fix: 345735235
Test: Unfold with landscape app
      Open YT in tabletop
      atest SizeCompatTests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:08f79506ae1a19ffa60ff69a868d6c3ee5aac846)
Merged-In: Iefaf6e2422e9c38fff7c3a931d94e94061bb5dd2
Change-Id: Iefaf6e2422e9c38fff7c3a931d94e94061bb5dd2