Fix CI by removing gen_pyi from mypy-stirct.ini (#48961)
Summary:
Fixes #{issue number}
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48961
Reviewed By: janeyx99
Differential Revision: D25383152
Pulled By: malfet
fbshipit-source-id: ce0226398522342256d0d701edc13955d1095a0d
