message: Change format of server usage limit message
  As per /
diff: @@ -434,7 +434,10 @@ const LoggedInView = React.createClass({
  }
  const usageLimitEvent = this.state.serverNoticeEvents.find((e) => {
  - return e && e.getType() === 'm.server_notice.usage_limit_reached';
  + return (
  + e && e.getType() === 'm.room.message' &&
  + e.getContent()['server_notice_type'] === 'm.server_notice.usage_limit_reached'
  + );
  });
  let topBar;
  