Fix the path in skia/skia_test_expectations.txt

It makes presubmit error:
The test file path has been changed by the following CL.
- https://codereview.chromium.org/477153005

TBR=mtklein@chromium.org,caryclark@google.com,fmalita@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

Review URL: https://codereview.chromium.org/497403002

Cr-Commit-Position: refs/heads/master@{#291623}
1 file changed