User can still see upload file popup even if `setUploadEnabled` is false

[mark-a-j-adriano]

Description:

• User are still able to upload files from their local even if we only want them to use the File management / Asset admin option
• They did receive Uploading not permitted. error message after trying.

Expected:

• The pop up to browse from local file should not show up when clicking anywhere inside the upload field.

https://github.com/silverstripe/silverstripe-asset-admin/assets/11882563/f8397411-fc04-484c-95e0-8694c9b8ea83

Packages:

• "name": "silverstripe/asset-admin", "version": "2.0.1",
• "name": "silverstripe/assets", "version": "2.0.3",
• "name": "silverstripe/cms", "version": "5.0.2",
• "name": "silverstripe/framework", "version": "5.0.8",

Sample code:

private static array $has_one = [
      'Image' => Image::class, 
 ];

 public function getCMSFields(): FieldList
 {
        $fields = parent::getCMSFields();
        $fields->addFieldToTab('Root.Main', $img1 = UploadField::create('Image', 'Image'));
        $img1->setFolderName('Sections')
            ->setIsMultiUpload(false)
            ->setAllowedMaxFileNumber(1)
            ->setUploadEnabled(false)
            ->setAllowedFileCategories('image');
}