message: persist and load collapsed rhs globally
diff: @@ -161,7 +161,7 @@ export default React.createClass({
  viewUserId: null,
  collapseLhs: false,
  - collapsedRhs: false,
  + collapsedRhs: window.localStorage.getItem("mx_rhs_collapsed") === "true",
  leftDisabled: false,
  middleDisabled: false,
  rightDisabled: false,
  @@ -656,11 +656,13 @@ export default React.createClass({
  });
  break;
  case 'hide_right_panel':
  + window.localStorage.setItem("mx_rhs_collapsed", true);
  this.setState({
  collapsedRhs: true,
  });
  break;
  case 'show_right_panel':
  + window.localStorage.setItem("mx_rhs_collapsed", false);
  this.setState({
  collapsedRhs: false,
  });
  