[canvaskit] Update examples after enum name change

Docs-Preview: https://skia.org/?cl=169186
Bug: skia:
Change-Id: I083a07cc44e1534f4aeedc4e25e8ed786e29f168
Reviewed-on: https://skia-review.googlesource.com/c/169186
Reviewed-by: Kevin Lubick <kjlubick@google.com>
3 files changed