OpInfo: minor fix in sample_inputs_diff (#59181)
Summary:
sample_inputs_diff constructs all five positional arguments for [diff ](https://pytorch.org/docs/stable/generated/torch.diff.html) but uses only the first three. This doesn't seem to be intentional.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59181
Test Plan: This change expands coverage of diff's OpInfo sample inputs. Related tests still pass.
Reviewed By: mruberry
Differential Revision: D28878359
Pulled By: saketh-are
fbshipit-source-id: 1466f6c6c341490885c85bc6271ad8b3bcdf3a3e
