pw_presubmit: Run black

Change-Id: Ifc3b5e0add6d4aed93e351e1f64b37ae66362cc0
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/168315
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/recipes/pw_presubmit.py b/recipes/pw_presubmit.py
index 02fe46d..07b1941 100644
--- a/recipes/pw_presubmit.py
+++ b/recipes/pw_presubmit.py
@@ -95,6 +95,7 @@
             status=common.SUCCESS,
         )
 
+
 def RunSteps(api, props):
     """Run Pigweed presubmit checks."""
     gcs_bucket = props.gcs_bucket