iris: fold render state into Ui

examples/bench_images.rs

@@ -40,12 +40,7 @@ impl DefaultAppState for State {
         }
     }
 
-    fn window_event(
-        &mut self,
-        event: winit::event::WindowEvent,
-        rsc: &mut DefaultRsc<Self>,
-        _render: &mut UiRenderState,
-    ) {
+    fn window_event(&mut self, event: winit::event::WindowEvent, rsc: &mut DefaultRsc<Self>) {
         if !matches!(event, winit::event::WindowEvent::RedrawRequested) {
             return;
         }