message: Stop listening to account data when the stickerpicker is unmounted
  Fixes
diff: @@ -103,6 +103,9 @@ export default class Stickerpicker extends React.Component {
  }
  componentWillUnmount() {
  + const client = MatrixClientPeg.get();
  + if (client) client.removeListener('accountData', this._updateWidget);
  +
  window.removeEventListener('resize', this._onResize);
  if (this.dispatcherRef) {
  dis.unregister(this.dispatcherRef);
  