Revert "formatted _decomp folder with black"
This reverts commit 4945c72151e29cb524974e1714654cf790ddb37d.
Reverted https://github.com/pytorch/pytorch/pull/79002 on behalf of https://github.com/janeyx99 due to Broke decomp tests on trunk + also on PR https://hud.pytorch.org/minihud#4945c72151e29cb524974e1714654cf790ddb37d
