Use resolved bounds in CompatDisplayInsets if letterboxed for aspect ratio

Activity can stay in size compat mode even when restarted if it is
letterboxed for aspect ratio but not letterboxed for fixed orientation.
This is because resolveAspectRatioRestriction is only called if
compatDisplayInsets is null since we assume aspect ratio is already
resolved in resolveFixedOrientationConfiguration if app is eligible for
size compat mode. With close to square displays, landscape app can have
orientation respected with insets (portrait display, landscape
orientation with 3BN mode enabled) but still letterboxed for aspect
ratio if user chooses aspect ratio or manufacturer overrides app's
aspect ratio.

CompatDisplayInsets should use resolved override bounds if activity is
letterboxed for fixed orientation or aspect ratio so size compat
calculations displays within these bounds and not task bounds.

Fix: 327210346
Test: atest SizeCompatTests
Change-Id: I47ca4412a89e0c672c0118658c33d29e15f30c95