[task scheduler] Fix tasks graph on job page
[task scheduler] Fix tasks graph on job page

Undo part of https://skia-review.googlesource.com/c/6221

BUG=skia:

Change-Id: I211c26bc06bbdfe87a502e4a1be0b8ceef91ffa0
Reviewed-on: https://skia-review.googlesource.com/6266
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@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