fix more examples

examples/window_focus.rs

@@ -21,7 +21,7 @@ fn app() -> Element {
         _ => {}
     });
 
-    rsx! {
+    render! {
         div { width: "100%", height: "100%", display: "flex", flex_direction: "column", align_items: "center",
             if focused() {
                 "This window is focused!"