Community creation preset frequency adjustments

As Community Presets are a new feature, there aren’t many available yet. This means you may encounter the same preset repeatedly.
This update should make that happen much less often:
- Lowered the overall chance of encountering a Community Preset.
- Fixed an issue that allowed the same Community Preset to appear multiple times during a session.
Thank you for your patience while I continue improving this new feature. If you experience any issues, or simply prefer not to use it, you can disable Community Presets from the main menu settings.