Uncomment step no-op test in test_optim (#70953)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70953
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D33767861
Pulled By: mikaylagawarecki
fbshipit-source-id: 8b41c8ee5d0e045436b10da5f68e9d5c5852c334
(cherry picked from commit 9224afc453cbc1c74da2b1c036dc78e1c210ac37)
