Thanks! You're the best!
I had to make one other adjustment for it to work.
Find:
$form->add( new \IPS\Helpers\Form\Url( 'fcc_image', $item ? $item['fcc_image'] : NULL, FALSE, array(), NULL, NULL, NULL, 'fcc_image' ) );
Replace with:
$form->add( new \IPS\Helpers\Form\Text( 'fcc_image', $item ? $item['fcc_image'] : NULL, FALSE, array(), NULL, NULL, NULL, 'fcc_image' ) );