Build multi-site plugin on its own stable-3.2 branch

Change-Id: I820799bda955a6ffd3ee3e8a04f4cddc6881a52f
diff --git a/jenkins/gerrit-bazel-plugin-multi-site.yaml b/jenkins/gerrit-bazel-plugin-multi-site.yaml
index a54e728..7756a92 100644
--- a/jenkins/gerrit-bazel-plugin-multi-site.yaml
+++ b/jenkins/gerrit-bazel-plugin-multi-site.yaml
@@ -1,14 +1,10 @@
 - project:
     name: multi-site
     jobs:
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
-          branch:
-            - master
-          gerrit-branch:
-            - master
-            - stable-3.2
       - 'plugin-{name}-bazel-{branch}':
           branch:
+            - master
+            - stable-3.2
             - stable-3.1
             - stable-3.0
             - stable-2.16