Remove master branch from force-draft

Drafts are no longer supported in gerrit from 2.15+

Change-Id: I30cd25314a7468b3450e991b0a90d29b41a42676
diff --git a/jenkins/gerrit-buck-bazel-plugin-force-draft.yaml b/jenkins/gerrit-buck-bazel-plugin-force-draft.yaml
index 8bcfa1d..1516e98 100644
--- a/jenkins/gerrit-buck-bazel-plugin-force-draft.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-force-draft.yaml
@@ -7,9 +7,6 @@
             - stable-2.12
             - stable-2.11
             - stable-2.10
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+      - 'plugin-{name}-bazel-{branch}':
           branch:
-            - master
-          gerrit-branch:
-            - master
             - stable-2.14