Remove a use of checkScript(str) (#35623)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35623
Python 2 has reached end-of-life and is no longer supported by PyTorch.
This test case is valid syntax in Python 3.
Test Plan: CI
Differential Revision: D20842874
Pulled By: dreiss
fbshipit-source-id: 9f12e046f827d4f9d5eca99b0b0b46f73e06ff51
