Fix typo in collect_env.py (#43050)
Summary:
Minor typo fix introduced in yesterdays PR: https://github.com/pytorch/pytorch/pull/42961
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43050
Reviewed By: ezyang, malfet
Differential Revision: D23130936
Pulled By: zou3519
fbshipit-source-id: e8fa2bf155ab6a5988c74e8345278d8d70855894
