onSubmit ARRAY_ERROR does not bubble to FieldArrayRenderProps

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

Bug

### What is the current behavior?

https://codesandbox.io/s/46ozq77v7

Type "test" or "fail" in Company, then submit

### What is the expected behavior?

`errors.customers[ARRAY_ERROR]` is available somewhere in render props

Note: these props do get flagged
```
"invalid": true,
"submitFailed": true,
```

However I dont see
```
"submitError": [],
```
And an `error` prop seems to be missing

### Extra

Code Sandbox has deps lists as 4.4.0
However in render props I see, not sure whats going on there
```
"__versions": {
"final-form": "4.3.1",
"react-final-form": "3.1.5"
}
```

Reproduce the report in the linked CodeSandbox using the stated Company values and inspect the FieldArrayRenderProps render props around submission. Compare the observed ARRAY_ERROR handling with the expected errors.customers[ARRAY_ERROR] value and the listed dependency versions. Done means the array-level submit error is exposed through the relevant render props without losing the existing invalid and submitFailed flags.

Written by the indexing model from the issue text.