Reimplement close_on_esc in breakout example

Addresses Bevy #12859 (bevyengine/bevy#12859)

crates/bevy_editor_pls/examples/breakout.rs

@@ -63,7 +63,7 @@ fn main() {
                 // `chain`ing systems together runs them in order
                 .chain(),
         )
-        .add_systems(Update, (update_scoreboard, bevy::window::close_on_esc))
+        .add_systems(Update, (update_scoreboard, close_on_esc))
         .run();
 }
 
@@ -417,3 +417,19 @@ fn collide_with_side(ball: BoundingCircle, wall: Aabb2d) -> Option<Collision> {
 
     Some(side)
 }
+
+fn close_on_esc(
+    mut commands: Commands,
+    focused_windows: Query<(Entity, &Window)>,
+    input: Res<ButtonInput<KeyCode>>,
+) {
+    for (window, focus) in focused_windows.iter() {
+        if !focus.focused {
+            continue;
+        }
+
+        if input.just_pressed(KeyCode::Escape) {
+            commands.entity(window).despawn();
+        }
+    }
+}