Remove unused ensureComponentIsNative mock

Summary: Changelog: [Internal]

Reviewed By: philIip

Differential Revision: D31893181

fbshipit-source-id: 63204b818465f8ae06135f42c63e1340f6abb351

Libraries/Components/Touchable/__mocks__/ensureComponentIsNative.js

@@ -1,12 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @format
- */
-
-'use strict';
-
-module.exports = () => true;