message: Show `default-branch-button` on Commit lists
diff: @@ -47,7 +47,8 @@ features.add({
  screenshot: 'https://user-images.githubusercontent.com/1402241/71886648-2891dc00-316f-11ea-98d8-c5bf6c24d85c.png',
  include: [
  features.isRepoTree,
  - features.isSingleFile
  + features.isSingleFile,
  + features.isCommitList
  ],
  load: features.nowAndOnAjaxedPages,
  init
  