Suppresess SmallRowLength failure Suppresses the ReadPixelsPBOTest.SmallRowLength failure that is happening on the experimental Linux/Intel config with OpenGL. Bug: angleproject:358407353 Change-Id: I2ebaf935cc4d2cf101e7a3597a16ceeffbd0c4d7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5774484 Commit-Queue: Brian Sheedy <bsheedy@chromium.org> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Auto-Submit: Brian Sheedy <bsheedy@chromium.org>