[powercycle] Fix missing comma
[powercycle] Fix missing comma

Change-Id: I9522265fe636d4eb540b93a19ddc48c1e54edf42
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/222916
Reviewed-by: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@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