gentest: remove empty line after license

Summary:
@public

This gets flagged by the linter. Remove it.

Reviewed By: SidharthGuglani

Differential Revision: D14682386

fbshipit-source-id: 612508b0906285e6420a553ac7a96d1024f1eac6

gentest/gentest.js

@@ -47,7 +47,6 @@ function printTest(e, LTRContainer, RTLContainer, genericContainer) {
     ' * This source code is licensed under the MIT license found in the LICENSE',
     ' * file in the root directory of this source tree.',
     ' */',
-    '',
     '// @Generated by gentest/gentest.rb from gentest/fixtures/' + document.title + '.html',
     '',
   ]);