Clang-format ImageInputOp (#20441)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20441
This op is fairly complex and the fact that it isn't formatted
correctly makes things that much harder to reason about. Clean it up.
Reviewed By: dreiss
Differential Revision: D15220006
fbshipit-source-id: 30632d8bdbf15f96e73d8b6c96c5f29c052e6e7c
