Remove fallback flag from subrun

Change-Id: I0f2f67167871c5d9b4ae929867e6382b6c0de5dc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255296
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed