Convert sticker tests to TypeScript

ts/test-both/types/Stickers_test.ts

@@ -1,9 +1,8 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2022 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
-/* global Signal */
+import { assert } from 'chai';
-
+import * as Stickers from '../../types/Stickers';
-const { Stickers } = Signal;
 
 describe('Stickers', () => {
   describe('getDataFromLink', () => {