GLES1: Use ASCII minus in comment Bug: angleproject:7933 Change-Id: I05fb4512594447ff02078f1845c1ceb74c1b27ce Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4374097 Reviewed-by: Yuxin Hu <yuxinhu@google.com> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>