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

csharp/tests/Facebook.Yoga/YGPaddingTest.cs

@@ -4,7 +4,6 @@
  * 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/YGPaddingTest.html
 
 using System;