Align casing in test_dispatch with dispatch keys. (#44933)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44933
Test Plan: Imported from OSS
Reviewed By: ezyang
Differential Revision: D23778247
Pulled By: ailzhang
fbshipit-source-id: bc3725eae670b03543015afe763cb3bb16baf8f6
