Use tolerance==0 to flatten curves in GrTriangulator

Bug: skia:10419
Change-Id: I6e331a10622a4e2d17442910f9ed6b3af92614e2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/353337
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed