message: remove group header expand right panel button
diff: @@ -1272,15 +1272,6 @@ export default React.createClass({
  <TintableSvg src="img/icons-share.svg" width="16" height="16" />
  </AccessibleButton>,
  );
  - if (this.props.collapsedRhs) {
  - rightButtons.push(
  - <AccessibleButton className="mx_GroupHeader_button"
  - onClick={this._onShowRhsClick} title={_t('Show panel')} key="_maximiseButton"
  - >
  - <TintableSvg src="img/maximise.svg" width="10" height="16" />
  - </AccessibleButton>,
  - );
  - }
  }
  const rightPanel = !this.props.collapsedRhs ? <RightPanel groupId={this.props.groupId} /> : undefined;
  