Prevent CircleOp from being tested with MSAA

Change-Id: I307322f2d5e66ef103bdeb791066d6bba11b70ff
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/431636
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed