Fix cargo test and a number of little cleanup bugs

packages/web/src/launch.rs

@@ -28,8 +28,7 @@ pub fn launch_virtual_dom(vdom: VirtualDom, platform_config: Config) {
     });
 }
 
-///
+/// Launch the web application with the given root component and config
 pub fn launch_cfg(root: fn() -> Element, platform_config: Config) {
-    let mut vdom = VirtualDom::new(root);
-    launch_virtual_dom(vdom, platform_config);
+    launch_virtual_dom(VirtualDom::new(root), platform_config);
 }