Show chat panel when opening a video room with unread messages (#8812)

* Show chat panel when opening a video room with unread messages

* Remove unnecessary calls to private methods in tests

* Make room ID mandatory when toggling the right panel

* Restore the isViewingRoom check

* Test RightPanelStore

* Make the constructor private again

* Add even more tests

* Fix onReady

src/components/structures/LoggedInView.tsx

@@ -493,7 +493,7 @@ class LoggedInView extends React.Component<IProps, IState> {
                 break;
             case KeyBindingAction.ToggleRoomSidePanel:
                 if (this.props.page_type === "room_view") {
-                    RightPanelStore.instance.togglePanel();
+                    RightPanelStore.instance.togglePanel(null);
                     handled = true;
                 }
                 break;