Support new scratch-blocks mutationToDom api.

src/containers/custom-procedures.jsx

@@ -75,7 +75,7 @@ class CustomProcedures extends React.Component {
         this.props.onRequestClose();
     }
     handleOk () {
-        const newMutation = this.mutationRoot ? this.mutationRoot.mutationToDom() : null;
+        const newMutation = this.mutationRoot ? this.mutationRoot.mutationToDom(true) : null;
         this.props.onRequestClose(newMutation);
     }
     handleAddLabel () {