[ONNX] Fix scalar type cast for comparison ops (#37787)
Summary:
Always promote type casts for comparison operators, regardless if the input is tensor or scalar. Unlike arithmetic operators, where scalars are implicitly cast to the same type as tensors.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37787
Reviewed By: hl475
Differential Revision: D21440585
Pulled By: houseroad
fbshipit-source-id: fb5c78933760f1d1388b921e14d73a2cb982b92f
