Clean up more examples

examples/file_explorer.rs

@@ -19,7 +19,7 @@ fn main() {
 
 const _STYLE: &str = manganis::mg!(file("./examples/assets/fileexplorer.css"));
 
-fn app(_props: ()) -> Element {
+fn app() -> Element {
     let files = use_signal(Files::new);
 
     rsx! {