Clean up a number of examples

examples/filedragdrop.rs

@@ -2,15 +2,15 @@ use dioxus::prelude::*;
 use dioxus_desktop::Config;
 
 fn main() {
-    let cfg = Config::new().with_file_drop_handler(|_w, e| {
-        println!("{e:?}");
-        true
-    });
-
-    dioxus_desktop::launch_with_props(app, (), cfg);
+    Config::new()
+        .with_file_drop_handler(|_w, e| {
+            println!("{e:?}");
+            true
+        })
+        .launch(app)
 }
 
-fn app() -> Element {
+fn app(_props: ()) -> Element {
     rsx!(
         div {
             h1 { "drag a file here and check your console" }