flip SKCMS_LEGACY_TF_INVERT

This should cause tiny diffs in most color managed drawing.

This feature ensures that inverting a transfer function correctly
roundtrips 1.0 to float precision.  Previously we'd only been as
precise as a half-float or so.

Relevant skcms changes:
    https://skia.googlesource.com/skcms/+/cecf6c0ebb913d64e3a373a5f2fa3f5cdff5c8a9
    https://skia.googlesource.com/skcms/+/ca80251f9aca2a4cb2cf98cca200025040f4c9bc

Change-Id: I529659a59df6a3f5502613903cba449c23be7576
Reviewed-on: https://chromium-review.googlesource.com/c/1405329
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621786}
60 files changed