ns for fx: further fixes for kwargs-only
Summary:
This is a follow-up to https://github.com/pytorch/pytorch/pull/78181,
apparently that PR did not fix all errors in a Meta model using
the NS shadow APIs.
We do not have an OSS repro, so putting the PR up so we can test in fbcode.
Test plan:
```
python test/test_quantization.py -k FXNumericSuite -f
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79015
Approved by: https://github.com/dzdang
