Additional Fields to Collect cannot be set read-only at creation

[SilentResonance]

Describe the bug
When adding "Attendees' data to collect", only a Required checkbox is available.
After creation, when you edit a field a Read Only checkbox is available.

To Reproduce
Steps to reproduce the behavior:

1. Go to Event detail
2. Click on 'Attendees' data to collect'
3. Scroll down to 'add new' and click
4. See dialog without Read Only checkbox
5. Fill fields (One choice list (radio button)) and save
6. Click on 'edit' of above created field
7. See dialog with Read Only checkbox

Expected behavior
Checkbox Read only in field creation dialog

Screenshots
Creation dialog checkboxes

Edit dialog after field creation and the shown checkboxes

Desktop (please complete the following information):

• OS: Windows 10
• Browser Firefox
• Version 121.0

Additional context
Docker Image Alf.io v.2.0-M4-2402-3 (non-dev)