17.0 Impossible to Opt Out from fully synchronized mailing lists

[btljb]

mass_mailing_list_dynamic

Cannot set OptOut for Mailing Contact

A clear and concise description of what the bug is.

To Reproduce

Affected versions: 17.0

Steps to reproduce the behavior:

1. Create a Dynamic Mailing List with Sync method Add and remove records as needed

2. Go to Recipients, open any Mailing Contact, check Opt Out and save

3. A validation error will pop up

Expected behavior
Blue hint in Mailing List form is suggesting, that removal of contacts from Dynamic list can be done through Opt Out.

Additional context

The error comes from mass_mailing_list_dynamic/models/mailing_contact.py

The api.constrains seems to be set up correctly, but the write() function in mass_mailing_partner (another model from OCA/social, which is in dependencies for mass_mailing_list_dynamic) passes the whole list of vals instead of just the Opt Out field, which triggers this check.

[pedrobaeza]

Can you please propose a pull request with such suggestions?