owners: add `class: plugins` to job type

Change-Id: Ia30fc26a2bfd2576561e52c467db40dc5d08d650
diff --git a/jenkins/gerrit-bazel-plugin-owners.yaml b/jenkins/gerrit-bazel-plugin-owners.yaml
index 199facc..0069283 100644
--- a/jenkins/gerrit-bazel-plugin-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-owners.yaml
@@ -2,6 +2,7 @@
     name: 'plugin-owners-bazel-{branch}'
     description: 'Plugin owners {branch} branch build with Bazel'
     defaults: plugin-template-bazel
+    class: plugins
     scm:
       - git:
           remotes: