example: remove unncessary cfg

examples/hello_world.rs

@@ -2,7 +2,7 @@ use dioxus::prelude::*;
 use dioxus_desktop::tao::menu::MenuBar;
 
 fn main() {
-    dioxus::desktop::launch_cfg(app, |c| c.with_window(|w| w.with_menu(MenuBar::default())));
+    dioxus::desktop::launch(app);
 }
 
 fn app(cx: Scope) -> Element {