Remove isOpaque parameter from CanvasKit SkRuntimeEffect APIs

Bug: skia:12643
Change-Id: I285d42c908c75532b78c9b80da7b6145e1b47fe7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/506458
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
10 files changed