Fix Unexpected token ) in babel-preset-react-native

Summary:
Fixes #15513

cc jeanlauliac
Closes https://github.com/facebook/react-native/pull/15517

Differential Revision: D5644626

Pulled By: TheSavior

fbshipit-source-id: f90b35c29a1e7cd5a829ae44237deb050f9a29e2

babel-preset/configs/main.js

@@ -6,7 +6,6 @@
  * LICENSE file in the root directory of this source tree. An additional grant
  * of patent rights can be found in the PATENTS file in the same directory.
  *
- * @format
  */
 'use strict';
 
@@ -37,7 +36,7 @@ const getPreset = (src, options) => {
     [
       'transform-es2015-modules-commonjs',
       {strict: false, allowTopLevelThis: true},
-    ],
+    ]
   );
 
   if (isNull || src.indexOf('async') !== -1 || src.indexOf('await') !== -1) {