tweak tolerance again for cubics

Bug: 845489
Bug: skia:7995
Change-Id: I05554377bd5630b7134864b6db282358613f1030
Reviewed-on: https://skia-review.googlesource.com/129721
Reviewed-by: Cary Clark <[email protected]>
Commit-Queue: Mike Reed <[email protected]>
2 files changed