Have default join form fields toggle to appear on registration forms

Currently, custom join form fields can be configured to appear on event registration forms. When enabled, these fields are visible to both new and existing members, allowing existing members to update their information during registration.

However, this functionality does not apply to default fields (e.g. Organisation Name, Phone Number, etc.), which are hidden for existing members. This limits the ability to collect or update key information from members through registration forms.

Introducing a setting that allows default fields to be toggled to display regardless of membership status would enable organisations to request and collect updated default information from all registrants (not just new members) during event registration.