Do not scale Letterbox Inner bounds

getLetterboxInnerBounds is assumed to return unscaled bounds,
just like getLetterboxOuterBounds. This CL fixes this behaviour
in getLetterboxInnerBounds by applying scaling only in
getCropBoundsIfNeeded, and never in adjustBoundsForTaskbar.

Bug: 269030028
Test: atest SizeCompatTests
Change-Id: I697e246bedced19009af24d0b7e81fc3d8f9a48c