Convert imports to ES6 from CommonJS

This is needed because `require()` means something different in webpack - it ends up importing the module as something we didn't expect (and is occasionally async)

src/components/views/settings/tabs/user/NotificationUserSettingsTab.js

@@ -16,7 +16,7 @@ limitations under the License.
 
 import React from 'react';
 import {_t} from "../../../../../languageHandler";
-const sdk = require("../../../../..");
+import * as sdk from "../../../../../index";
 
 export default class NotificationUserSettingsTab extends React.Component {
     constructor() {