Fix dropped ref to fields-config

MultiEdit will need revisiting to use data components and validate.

app/src/frontend/building/multi-edit.tsx

@@ -4,10 +4,11 @@ import { parse } from 'query-string';
 import PropTypes from 'prop-types';
 
 import Sidebar from './sidebar';
-import CONFIG from './fields-config.json';
 import InfoBox from '../components/info-box';
 import { sanitiseURL } from '../helpers';
 
+const CONFIG = [];
+
 const MultiEdit = (props) => {
     if (!props.user){
         return <Redirect to="/sign-up.html" />