Remove jshint - move everything over to eslint

Also removed all hints of previous linters

js/permissions_popup_start.js

@@ -1,4 +1,8 @@
-$(document).on('keyup', function(e) {
+/* global $, Whisper, i18n */
+
+$(document).on('keyup', e => {
+  'use strict';
+
   if (e.keyCode === 27) {
     window.closePermissionsPopup();
   }
@@ -11,6 +15,8 @@ window.view = new Whisper.ConfirmationDialogView({
   message: i18n('audioPermissionNeeded'),
   okText: i18n('allowAccess'),
   resolve: () => {
+    'use strict';
+
     window.setMediaPermissions(true);
     window.closePermissionsPopup();
   },