Facebook picture is always 50px

Hey!

### Issue

After login facebook picture is always 50px why is this happening? 

### My env

PHP: any

Library: latest

Provider: facebook

Provider options:

```php
[
  'options' => [
      'stateless' => true,
      'identity.fields' => [
             'email',
             'name',
             'picture.width(99999)',
       ],
],
];
```

Thanks :smiley_cat:
