LibWeb: Detach any LayoutNode from its parent if present in ~Node()

Libraries/LibWeb/DOM/Node.cpp

@@ -55,6 +55,8 @@ Node::Node(Document& document, NodeType type)
 
 Node::~Node()
 {
+    if (layout_node() && layout_node()->parent())
+        layout_node()->parent()->remove_child(*layout_node());
 }
 
 const HTMLAnchorElement* Node::enclosing_link_element() const