Simplify header inclusion in test/cpp/api/modules.cpp (#25921)
Summary:
This PR simplifies header inclusion in `test/cpp/api/modules.cpp`, so that when we add a new `torch::nn` module and add the test in `modules.cpp`, we can check that the new module's header is included in `torch/torch.h`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25921
Differential Revision: D17303220
Pulled By: yf225
fbshipit-source-id: 327db0ff2f075d52e7b594b3dffc5a59441e0931
