Fix error occur when use SimpleForm with ArrayInput

[ghost]

The issue:
Now destroyOnUnregister configuration of react-final-form has problem.
If set destroyOnUnregister to true on Form component of react-final-form, the following problems arise.

Of course I can use it wrapped, but I modified it myself cuz I wanted to use SimpleForm that the react-admin provides as it is.

The fixed:
Remove destroyOnUnregister configuration on SimpleForm.

please check and accept my pull request. :)

[tdeo]

I was running into something similar inside a TabbedForm, should the same be done there ?

[ghost]

@tdeo yes right.
I checked again to whole project after looked at your comment.
As a result, they were used in SimpleForm and TabbedForm...
I just removed destroyOnUnregister on TabbedForm and push.

If you want to use TabbedForm or SimpleForm with ArrayInput right now, you can use it as follows until it is updated.

<SimpleForm destroyOnUnregister={false}></SimpleForm>

or

<TabbedForm destroyOnUnregister={false}></TabbedForm>

thanks for your comment!

[djhi]

I think I added this prop when I was working on dynamic forms. Let's remove it for the default as it's possible to add it when needed.

Thanks!

[fzaninotto]

Thanks!