fix: apply context fix for vue 3 transition-group

This implements the fix from @danielsussa. 🙏

Author: marshallswain

src/core/componentStructure.js

@@ -1,4 +1,8 @@
-const getHtmlElementFromNode = ({ el }) => el;
+const getHtmlElementFromNode = node => {
+  const el =
+    node.el || (Array.isArray(node.children) && node.children[0].el.parentNode);
+  return el || {};
+};
 const addContext = (domElement, context) =>
   (domElement.__draggable_context = context);
 const getContext = domElement => domElement.__draggable_context;