make the root component take no arguments

packages/core/compile_tests/props_safety.rs

@@ -2,7 +2,7 @@ use dioxus::prelude::*;
 
 fn main() {}
 
-fn app(cx: Scope) -> Element {
+fn app() -> Element {
     let count: &RefCell<Vec<Element>> = cx.use_hook(|| RefCell::new(Vec::new()));
 
     render! {

packages/core/compile_tests/props_safety.stderr

@@ -1,7 +1,7 @@
 error[E0521]: borrowed data escapes outside of function
   --> compile_tests/props_safety.rs:8:5
    |
-5  |   fn app(cx: Scope) -> Element {
+5  |   fn app() -> Element {
    |          --
    |          |
    |          `cx` is a reference that is only valid in the function body

packages/core/compile_tests/props_safety_temporary_values.rs

@@ -2,7 +2,7 @@ use dioxus::prelude::*;
 
 fn main() {}
 
-fn app(cx: Scope) -> Element {
+fn app() -> Element {
     let count = vec![1, 2, 3];
 
     render! {