Make make_dual also return namedtuple when level less than zero (#68628)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/68628
Test Plan: Imported from OSS
Reviewed By: jbschlosser
Differential Revision: D32899681
Pulled By: soulitzer
fbshipit-source-id: 61ed09f4038e19817978a521e9571fdc482b424b
