Fix gm slide 'TessellationTestRectShader'.

This needed to be updated to match changes in
http://review.skia.org/382476. It is not tested on any of the normal
CQ trybots.

Change-Id: I3c0843d8e77958192c0db9ad8f6b797aec887fe4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/382757
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
1 file changed