Remove a redundant position assignment from stroke tessellation shaders

Bug: skia:10419
Change-Id: I74429ceb1fc03e68872c74eb62f64675e1bd55cc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327476
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed