Build the admin-console plugin separately for master and stable-2.16

Due to API changes the plugin's master branch is no longer buildable
against both master and stable-2.16 of the plugin API.

Change-Id: If9220b69bee39aa0f3c84a444f9c2d6849a3aa8d
diff --git a/jenkins/gerrit-buck-bazel-plugin-admin-console.yaml b/jenkins/gerrit-buck-bazel-plugin-admin-console.yaml
index c435fa9..73c58ae 100644
--- a/jenkins/gerrit-buck-bazel-plugin-admin-console.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-admin-console.yaml
@@ -7,13 +7,9 @@
             - stable-2.12
             - stable-2.11
             - stable-2.10
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
-          branch:
-            - master
-          gerrit-branch:
-            - master
-            - stable-2.16
       - 'plugin-{name}-bazel-{branch}':
           branch:
+            - master
+            - stable-2.16
             - stable-2.15
             - stable-2.14