Don't copy non-clonable nodes

Author: space-nuko

src/litegraph.js

@@ -7109,6 +7109,8 @@ LGraphNode.prototype.executeAction = function(action)
         var selected_nodes_array = [];
         for (var i in this.selected_nodes) {
             var node = this.selected_nodes[i];
+			if (node.clonable === false)
+				continue;
             node._relative_id = index;
             selected_nodes_array.push(node);
             index += 1;