Fix the te fuser setup (#963)
Summary:
Correctly enable `te` fuser environment when fuser is specified as `te`.
Fixes https://github.com/pytorch/benchmark/issues/956
Pull Request resolved: https://github.com/pytorch/benchmark/pull/963
Reviewed By: davidberard98
Differential Revision: D37218257
Pulled By: xuzhao9
fbshipit-source-id: 07019cd3fd302213eb8c21245abaa9fcfbb3b6ae
