Add missing credentials-id to the account plugin gerrit source

The accounts plugin uses two sources, one for the plugin and one
for gerrit. The second source was initially overlooked and was missing
the credentials-id and therefore failing the build.

Change-Id: Ib65858cdf0d78a9ee37c98bbbeef2945f834626b
diff --git a/jenkins/gerrit-bazel-plugin-account.yaml b/jenkins/gerrit-bazel-plugin-account.yaml
index 9645827..b009859 100644
--- a/jenkins/gerrit-bazel-plugin-account.yaml
+++ b/jenkins/gerrit-bazel-plugin-account.yaml
@@ -13,6 +13,7 @@
                 credentials-id: gerrit.googlesource.com
             - gerrit:
                 url: https://gerrit.googlesource.com/a/gerrit
+                credentials-id: gerrit.googlesource.com
           branches:
             - origin/{branch}
           submodule: