[gold] Remove old column header
[gold] Remove old column header

Bug: skia:10355
Change-Id: I64f45c2ac7ca675931ca71f383c12af0d18b9156
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/295592
Reviewed-by: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot