Text field initial values not displaying

Version: v4.2.0

To reproduce (in any InvenioRDM instance):

1. Create a community
2. Go to the "Settings" page
3. Default values for text fields (but not TextArea fields) are empty:

<img width="951" alt="image" src="https://github.com/user-attachments/assets/1bdb4a3b-7140-4f1d-b154-27dc9baa2d70">
