Field level submission errors are not propagated to meta.submissionError

### Are you submitting a **bug report** or a **feature request**?

**bug report**

### What is the current behavior?

Submission errors to "deep" fields do not propagate to field level `meta.submissionError` prop. I.e. if one would have a form with state of
```TypeScript
{
'profile.userName': 'Aasd',
}
```

and submitting this data would result in the following error object from submit function:
```TypeScript
{
'profile.userName': 'This value wont do',
}
```

The above error will not show up in the field for `profile.userName`.

See sandbox for reproduction: [https://codesandbox.io/s/0o9lmozrmv](https://codesandbox.io/s/0o9lmozrmv)

### What is the expected behavior?

The field meta should have `submissionError` set to 'This value wont do'.

### Sandbox Link

https://codesandbox.io/s/0o9lmozrmv

### What's your environment?

"react-final-form": "^3.6.5"
"final-form": "^4.9.1"

### Other information