Make cargo check --all --examples work!

packages/signals/examples/selector.rs

@@ -2,17 +2,17 @@ use dioxus::prelude::*;
 use dioxus_signals::*;
 
 fn main() {
-    dioxus_desktop::launch(App);
+    // dioxus_desktop::launch(App);
 }
 
 #[component]
 fn App() -> Element {
-    let signal = use_signal(|| 0);
+    let mut signal = use_signal(|| 0);
     let doubled = use_selector(move || signal * 2);
 
     rsx! {
         button {
-            onclick: move |_| *signal.write() += 1,
+            onclick: move |_| signal += 1,
             "Increase"
         }
         Child { signal: doubled }