Minor improvement to C++ nn::Distance tests (#26539)
Summary:
C++ `nn::Distance` tests can take advantage of the newly released multi-dimensional tensor constructor https://github.com/pytorch/pytorch/pull/26210 to simplify the tensor constructions.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26539
Differential Revision: D17501041
Pulled By: yf225
fbshipit-source-id: 21d5f95ab3ec02227115c823c581218cee2ce458
