05/03/2024: Preserve the state of unengaged & dormant milestone options / preferences

🐛 Bug Fix: Settings loaded for an audience should be consistent with the options recently saved by the user

1. New broadcasts have dormant and unengaged milestone options selected by default. Existing broadcasts now honour the current state of these options.

👩‍💻Ella Muir 👨‍💻Inigo Pascall