Decrease the tolerance for classifying degenerate cubics

Bug: skia:
Change-Id: I118f52301146ed7a7333d4f6bd2297d500a0df97
Reviewed-on: https://skia-review.googlesource.com/21187
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed