Make clippy happy

packages/core/tests/create_fragments.rs

@@ -7,7 +7,7 @@ use dioxus_core::ElementId;
 #[test]
 fn empty_fragment_creates_nothing() {
     fn app() -> Element {
-        rsx!({ () })
+        rsx!({})
     }
 
     let mut vdom = VirtualDom::new(app);