Fix typo in GrTextureEffect::onIsEqual

Comparing y shader mode with x shader mode.

Change-Id: I022948596de966ae2d6179f7762e95300301757c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270942
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed