output vertex ref's before children again, for easier following of hierarchy in visual inspection of egg files

panda/src/egg/eggGroup.cxx

@@ -287,10 +287,10 @@ write(ostream &out, int indent_level) const {
 
   EggRenderMode::write(out, indent_level + 2);
 
-  EggGroupNode::write(out, indent_level + 2);
-
   write_vertex_ref(out, indent_level + 2);
 
+  EggGroupNode::write(out, indent_level + 2);
+
   indent(out, indent_level) << "}\n";
 }