Build code-owners plugin on stable-3.3

Change-Id: Idcf803504683fdaf4b562a0bf78c85f4d2e823b0

jenkins/gerrit-bazel-plugin-code-owners.yaml

diff --git a/jenkins/gerrit-bazel-plugin-code-owners.yaml b/jenkins/gerrit-bazel-plugin-code-owners.yaml
index 0be73dd..8794cd0 100644
--- a/jenkins/gerrit-bazel-plugin-code-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-code-owners.yaml
@@ -1,9 +1,7 @@
 - project:
     name: code-owners
     jobs:
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+      - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
-          gerrit-branch:
-            - master
             - stable-3.3