Fix export for davclient.js legacy dependency

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

core/src/OC/backbone-webdav.js

@@ -55,7 +55,7 @@
  */
 
 import _ from 'underscore'
-import dav from 'davclient.js'
+import { dav } from 'davclient.js'
 
 const methodMap = {
 	create: 'POST',

core/src/globals.js

@@ -36,7 +36,7 @@ import Backbone from 'backbone'
 import 'bootstrap/js/dist/tooltip'
 import './Polyfill/tooltip'
 import ClipboardJS from 'clipboard'
-import dav from 'davclient.js'
+import { dav } from 'davclient.js'
 import DOMPurify from 'dompurify'
 import Handlebars from 'handlebars'
 import 'jcrop/js/jquery.Jcrop'

core/webpack.js

@@ -22,7 +22,11 @@ module.exports = [
 			rules: [
 				{
 					test: /davclient/,
-					use: 'exports-loader?dav'
+					loader: 'exports-loader',
+					options: {
+						type: 'commonjs',
+						exports: 'dav',
+					}
 				}
 			]
 		},