Make clippy happy

packages/ssr/tests/simple.rs

@@ -9,7 +9,7 @@ fn simple() {
     }
 
     let mut dom = VirtualDom::new(App);
-    _ = dom.rebuild(&mut dioxus_core::NoOpMutations);
+    dom.rebuild(&mut dioxus_core::NoOpMutations);
 
     assert_eq!(dioxus_ssr::render(&dom), "<div>hello!</div>");