Issue with django.forms.fields.FilePathField() and callable path

Hi,

First post here, so I don't know if it's the correct channel for this kind of issue.

Sorry if it's not.

Since v 3.0 we can set path attribute as a callable in a models.fields.FilePathField(),

as discussed here:

https://code.djangoproject.com/ticket/29529

and documented here:

https://docs.djangoproject.com/en/3.0/ref/models/fields/#django.db.models.FilePathField.path

The commit adding this feature can be found here:

https://github.com/django/django/commit/ef082ebb84f00e38af4e8880d04e8365c2766d34

I have an issue when I try to use django.forms.fields.FilePathField()

https://github.com/django/django/blob/stable/3.2.x/django/forms/fields.py#L1095

In the case where path is defined as a callable, and os.scandir(self.path) is called (as showed in  l.1126).

I 'm facing this explicit error:

"scandir: path should be string, bytes, os.PathLike, integer or None, not function"

If I override self.path with a pre-check similar to what it was done for the added feature

it seems to solve this issue.

```

...

path = self.path() if callable(self.path) else self.path

for f in os.scandir(path):

...

```

I don't know if it's a bug or if I miss something using models.fields.FilePathField() and django.forms.fields.FilePathField()

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