clippy fixes from 1.69.0

examples/custom_window_frame/src/main.rs

@@ -18,7 +18,7 @@ fn main() -> Result<(), eframe::Error> {
     eframe::run_native(
         "Custom window frame", // unused title
         options,
-        Box::new(|_cc| Box::new(MyApp::default())),
+        Box::new(|_cc| Box::<MyApp>::default()),
     )
 }