SelectProperty invalid type

[instance-pro]

Describe the bug
Invalid select field type. In the backend it shows that it is a varchar field. However, an integer field is created in the model.

To Reproduce
Steps to reproduce the behavior:

1. Go to Extension Builder
2. Click on New Model Object
3. Create a new Property of type Select
4. See error in the model after you create the extension

Expected behavior
Either an integer or varchar would have to be configurable, currently it is mixed.

Screenshots
If applicable, add screenshots to help explain your problem.

TYPO3 Version
12

Extension Builder Version:
v12.0.0-beta.2

Additional context
affected files:
https://github.com/FriendsOfTYPO3/extension_builder/blob/v12.0.0-beta.2/Resources/Private/CodeTemplates/Extbase/Partials/TCA/SelectProperty.phpt
https://github.com/FriendsOfTYPO3/extension_builder/blob/v12.0.0-beta.2/Classes/Domain/Model/DomainObject/SelectProperty.php