message: Remove redundant isUserJoined
diff: @@ -258,7 +258,7 @@ module.exports = React.createClass({
  }
  }).done();
  }
  - } else if (isUserJoined) {
  + } else {
  MatrixClientPeg.get().stopPeeking();
  this.setState({
  unsentMessageError: this._getUnsentMessageError(room),
  