Fix ruff formatting in test_torch_compile.py

Add missing blank line between test functions to satisfy PEP 8 / ruff format check.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: wenxin0319

tests/test_torch_compile.py

@@ -123,6 +123,7 @@ def test_dmd2_compile_disabled(dmd2_model_not_compiled):
     assert not _is_compiled(dmd2_model_not_compiled.fake_score)
     assert not _is_compiled(dmd2_model_not_compiled.discriminator)
 
+
 def test_compile_excludes_ema(sft_model_not_compiled):
     # EMA networks live in model_dict but are weight-averaged copies that are not run
     # during training, so apply_torch_compile must not compile them.