Default DesktopApp to the standard UI state

examples/message_list/desktop.rs

@@ -6,5 +6,5 @@ mod app;
 
 fn main() {
     let attributes = WindowAttributes::default().with_inner_size(LogicalSize::new(420.0, 900.0));
-    DesktopApp::<DesktopUiState>::run_with_attributes(attributes, app::build);
+    DesktopApp::run_with_attributes(attributes, app::build);
 }