Simplify master branch name for review-by-blame

Change-Id: Ia21c3d9fd2cd393dee66f5af71c0dab48650bb30
diff --git a/jenkins/gerrit-bazel-plugin-reviewers-by-blame.yaml b/jenkins/gerrit-bazel-plugin-reviewers-by-blame.yaml
index 1d312c8..c7f81cd 100644
--- a/jenkins/gerrit-bazel-plugin-reviewers-by-blame.yaml
+++ b/jenkins/gerrit-bazel-plugin-reviewers-by-blame.yaml
@@ -5,10 +5,10 @@
           branch:
             - master
           gerrit-branch:
-            - master
             - stable-3.5
             - stable-3.6
             - stable-3.7
       - "plugin-{name}-bazel-{branch}":
           branch:
+            - master
             - stable-3.4