Add a link in room settings to get at the tombstoned room if it exists

Fixes https://github.com/vector-im/riot-web/issues/8542

src/components/views/dialogs/RoomSettingsDialog.js

@@ -52,7 +52,7 @@ export default class RoomSettingsDialog extends React.Component {
         tabs.push(new Tab(
             _td("Advanced"),
             "mx_RoomSettingsDialog_warningIcon",
-            <AdvancedRoomSettingsTab roomId={this.props.roomId} />,
+            <AdvancedRoomSettingsTab roomId={this.props.roomId} closeSettingsFn={this.props.onFinished} />,
         ));
 
         return tabs;