Windows build updates (#39035)
Summary:
Small follow-up updates https://github.com/pytorch/pytorch/pull/38971
- Remove extra whitespace
- Delete unused script files
- Modify `vs_install.ps1` to use correct workspace path
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39035
Differential Revision: D21731129
Pulled By: malfet
fbshipit-source-id: e04253e82f8753423b4634d1928f2d0fcf20ebbb