[pytorch] fix ConstRefCType usage in codegen/api/native.py (#50742)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50742
Fixed the other usage of `BaseCType('const ...&)` on #49138.
Checked byte-for-byte compatibility of the codegen output.
Test Plan: Imported from OSS
Reviewed By: ezyang
Differential Revision: D25955565
Pulled By: ljk53
fbshipit-source-id: 83ebd6b039892b805444867ed97a6e2fa6e72225
