[REF] vdom: simplify vnode function

This is a snabbdom commit

src/vdom.ts

@@ -59,14 +59,7 @@ function vnode(
   elm: Element | Text | undefined
 ): VNode {
   let key = data === undefined ? undefined : data.key;
-  return {
+  return {sel, data, children, text, elm, key};
-    sel: sel,
-    data: data,
-    children: children,
-    text: text,
-    elm: elm,
-    key: key
-  };
 }
 
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