Fix copy_transpose_valid check (#20759)
Summary:
Fixes #20755
(Was broken in #20685)
cc vadimkantorov
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20759
Differential Revision: D15433712
Pulled By: colesbury
fbshipit-source-id: 29f612f7d4d7b73158d6f5dc1e46fd2f8fb09a2f
