Properly resize lightmap along with game render texture

src/app.rs

@@ -88,6 +88,9 @@ impl App {
                     self.rt =
                         RenderTexture::new(width / self.scale as u32, height / self.scale as u32)
                             .unwrap();
+                    self.light_map =
+                        RenderTexture::new(width / self.scale as u32, height / self.scale as u32)
+                            .unwrap();
                     let view = View::from_rect(Rect::new(0., 0., width as f32, height as f32));
                     self.rw.set_view(&view);
                 }