Remove master branch for buck build for verify-status

Change-Id: I64c7dc178b77b649c95e8215a3fb723346276c2a
diff --git a/jenkins/gerrit-buck-bazel-plugin-verify-status.yaml b/jenkins/gerrit-buck-bazel-plugin-verify-status.yaml
index 71b3b04..ebec51d 100644
--- a/jenkins/gerrit-buck-bazel-plugin-verify-status.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-verify-status.yaml
@@ -3,7 +3,6 @@
     jobs:
       - 'plugin-{name}-{branch}':
           branch:
-            - master
             - stable-2.13
       - 'plugin-{name}-bazel-{branch}':
           branch: