Fix compilation

Author: asashour

034-flutter-web-part3-template-layouts/lib/widgets/navigation_bar/navigation_bar_mobile.dart

@@ -15,7 +15,7 @@ class NavigationBarMobile extends StatelessWidget {
           IconButton(
             icon: Icon(Icons.menu),
             onPressed: () {
-            Scaffold.of(context).openDrawer(),
+              Scaffold.of(context).openDrawer();
             },
           ),
           NavBarLogo()