Build log-level plugin on its own stable-3.2 branch

Change-Id: I253158224474ba515de89999234df3363672244e
diff --git a/jenkins/gerrit-bazel-plugin-log-level.yaml b/jenkins/gerrit-bazel-plugin-log-level.yaml
index 6a10f58..83b097c 100644
--- a/jenkins/gerrit-bazel-plugin-log-level.yaml
+++ b/jenkins/gerrit-bazel-plugin-log-level.yaml
@@ -6,9 +6,9 @@
             - master
           gerrit-branch:
             - master
-            - stable-3.2
       - 'plugin-{name}-bazel-{branch}':
           branch:
+            - stable-3.2
             - stable-3.1
             - stable-3.0
             - stable-2.16