Change sprite of guards while strafing around them

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/sprite_gallery.dart

@@ -10,7 +10,10 @@ class SpriteGallery extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text("VSWAP Sprite Gallery")),
+      appBar: AppBar(
+        title: const Text("VSWAP Sprite Gallery"),
+        automaticallyImplyLeading: true,
+      ),
       backgroundColor: Colors.black,
       body: GridView.builder(
         gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(