Change init action hook to acf/init

[JUVOJustin]

Hi, i tried registering fields based on the returned value of already registered fields. I was not able to do so, since i later noticed acf-composer uses the init action hook. I did not dig very deep into the code, but it should be save to simply switch the hook to the acf/init hook that is also used throughout the acf documentation.

I did a small test and switched the action locally. Everything worked as expected. However, I noticed that once I call the get_field() function the field group get no longer added.

Example code:

namespace App\Fields;

use Log1x\AcfComposer\Field;
use StoutLogic\AcfBuilder\FieldNameCollisionException;
use StoutLogic\AcfBuilder\FieldsBuilder;

class Products extends Field
{
    /**
     * The field group.
     *
     * @return array
     * @throws FieldNameCollisionException
     */
    public function fields(): array
    {

        $products = new FieldsBuilder('products');
        $field_name = get_field( 'attribute_name', 1234);

        $products
                ->addText($field_name);

        $products
            ->setLocation('post_type', '==', PRODUCTS_PT)
            ->or('post_type', '==', PRODUCTS_STAGED_PT);

        return $products->build();
    }
}