chore: skip google-iam-policy rather than java-iam (#1779)

Author: suztomo

docker/owlbot/java/src/fix-poms.py

@@ -330,8 +330,9 @@ def main():
  )
  main_module = existing_modules[artifact_id]
 
+ # Artifact ID is part of distribution name field in .repo-metadata.json
  if artifact_id in ["grafeas", "google-cloud-dns",
- "google-cloud-notification", "java-iam"]:
+ "google-cloud-notification", "google-iam-policy"]:
  # There are special libraries that are not automatically generated
  print(f"Skipping a special case library {artifact_id} that do not have "
  " the standard module structure.")