[FIX] base, contact: add conditions in Set Defaults form

Version: only V16.0 (will be improve in future versions)

Steps to reproduce:
    - install the "contacts" module;
    - go to a contact;
    - go to the "Set Defaults" tab (in the debug menu).

Issue:
    There is no field that allows you to select the condition.

Cause:
    The function `getConditions` needs the `change_default` attribute of the field.

Solution:
    Add the `change_default` attribute to the list which is returned by the `_get_view_field_attributes` function.

opw-3079328

closes odoo/odoo#106350

Signed-off-by: Denis Ledoux (dle) <dle@odoo.com>