[status] Fix retry button
[status] Fix retry button

We weren't tracking changes to task_scheduler_url and were therefore
setting the URL before task_scheduler_url was even set, and never
updating it.

Bug: skia:7153
Change-Id: I87c8df9d03a228df0a308d09f34df14ea5da8c20
Reviewed-on: https://skia-review.googlesource.com/59080
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@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