Remove apparently unnecessary std::remove_cv_t (#66254)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66254
`std::decay_t` already implies dropping the const
Test Plan: Sandcastle
Reviewed By: malfet
Differential Revision: D31465856
fbshipit-source-id: 851cdb9194354fe9a89b3a37a4463a43dbbcd77a
