[easy][PyTorch] Use `at::native::is_nonzero` (#67195)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67195
Now that `is_nonzero` is part of `at::native` refer https://github.com/pytorch/pytorch/pull/66663, replacing `TensorCompare::is_nonzero` to `at::native::is_nonzero`
ghstack-source-id: 141514416
Test Plan: CI
Reviewed By: larryliu0820
Differential Revision: D31704041
fbshipit-source-id: 36813e5411d0aa2eb2d0442e2a195bbed417b33d
