Remove logic from abstract type

[koertho]

This logic should not be in the abstract type, as it is generic. Should be moved to the FormGeneratorListener.

https://github.com/heimrichhannot/contao-form-type-bundle/blob/73e9be046aed5cc3066406d3ba7cd207b497cf8c/src/FormType/AbstractFormType.php#L96C1-L106C10