message: Fix unread "undefined" icon
diff: @@ -42,18 +42,18 @@ window.markUnread = (() => {
  const type = pageDetect.isPR() ? 'pull-request' : 'issue';
  const url = stripHash(location.href);
  - const stateLabel = $('.gh-header-meta .state');
  + const stateLabel = $('.gh-header-meta .State');
  let state;
  - if (stateLabel.hasClass('state-open')) {
  + if (stateLabel.hasClass('State--green')) {
  state = 'open';
  }
  - if (stateLabel.hasClass('state-merged')) {
  + if (stateLabel.hasClass('State--purple')) {
  state = 'merged';
  }
  - if (stateLabel.hasClass('state-closed')) {
  + if (stateLabel.hasClass('State--red')) {
  state = 'closed';
  }
  