fix(ApplicationFlags): export class (#5465)

esm/discord.mjs

@@ -10,6 +10,7 @@ export const {
   ShardingManager,
   WebhookClient,
   ActivityFlags,
+  ApplicationFlags,
   BitField,
   Collection,
   Constants,

src/index.js

@@ -13,6 +13,7 @@ module.exports = {
 
   // Utilities
   ActivityFlags: require('./util/ActivityFlags'),
+  ApplicationFlags: require('./util/ApplicationFlags'),
   BitField: require('./util/BitField'),
   Collection: require('./util/Collection'),
   Constants: require('./util/Constants'),