message: fix visibility of topbar close on dark theme, fixing
diff: @@ -38,7 +38,7 @@ module.exports = React.createClass({
  title="Scroll to unread messages"/>
  Jump to first unread message.
  </div>
  - <img className="mx_TopUnreadMessagesBar_close"
  + <img className="mx_TopUnreadMessagesBar_close mx_filterFlipColor"
  src="img/cancel.svg" width="18" height="18"
  alt="Close" title="Close"
  onClick={this.props.onCloseClick} />
  