[canvaskit] Update jsfiddle links and fix renderSKP

Leftover API changes from removing Sk.

Bug: skia:10717
Change-Id: I5b3ab4b5e20212e734558437090600cf6387410c
Docs-Preview: https://skia.org/?cl=323886
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/323886
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2 files changed