Newly created channels did not pop up at the top in the demo app

[laevandus]

🎯 Goal

• New channels do not show up at the top

📝 Summary

I changed the sorting in #3573, but realised that newly created channels do not show up at the top. Switched over to the default sorting key, works, although it triggers some movement when paginating the channel list.

🛠 Implementation

🎨 Showcase

🧪 Manual Testing Notes

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• Changelog is updated with new localization keys
• New code is covered by unit tests
• Documentation has been updated in the docs-content repo