[PyTorch][easy] Fix missing move in UnionType::createWithContained (#66691)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66691
Does what it says on the tin.
ghstack-source-id: 140736047
Test Plan: CI
Reviewed By: suo
Differential Revision: D31691627
fbshipit-source-id: 21a5d0248bf3412f5af36260597a5f663ab34361
