tools: format Python scripts

By default scripts without `.py` extension do not get picked up by

    git cl format

Change-Id: I09bc6cb45adfae4909c38c5e399f04a9d8d016ed
diff --git a/tools/heap_profile b/tools/heap_profile
index d705914..8f57b59 100755
--- a/tools/heap_profile
+++ b/tools/heap_profile
@@ -382,9 +382,10 @@
   profile_files = os.listdir(profile_path)
   if not profile_files:
     print("No profiles generated", file=sys.stderr)
-    print("If this is unexpected, check "
-          "https://docs.perfetto.dev/#/heapprofd?id=troubleshooting.",
-          file=sys.stderr)
+    print(
+        "If this is unexpected, check "
+        "https://docs.perfetto.dev/#/heapprofd?id=troubleshooting.",
+        file=sys.stderr)
     return 1
 
   subprocess.check_call(