Fix webpack build with new CSP on 15

Signed-off-by: Julius Härtl <jus@bitgrid.net>

js/init.js

@@ -1,5 +1,8 @@
 'use strict';
 
+/* global __webpack_nonce__ OC */
+__webpack_nonce__ = btoa(OC.requestToken); // eslint-disable-line no-native-reassign
+
 // used for building a vendor stylesheet
 import 'ng-sortable/dist/ng-sortable.css';
 

js/webpack.dev.config.js

@@ -2,5 +2,6 @@ const merge = require('webpack-merge');
 const baseConfig = require('./webpack.config.js');
 
 module.exports = merge(baseConfig, {
-  mode: 'development'
+  mode: 'development',
+  devtool: 'source-map',
 });