Fix fx test for S3D (#84526)
Fixing [failing](https://github.com/pytorch/pytorch/runs/8083404365?check_suite_focus=true) tests by adjusting the input size for S3D. The reason the test is failing is because S3D requires a bigger input size than previously passed.
As noted before, TorchVision already checks that its models are FX traceable and ensures all the tests are updated and work properly prior adding new architectures. The tests here seem to duplicate our efforts and often break because they don't factor in details about each model. It might be worth considering running TorchVision's tests instead.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84526
Approved by: https://github.com/pbelevich
