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 #731, 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.

🧪 Testing

Describe the steps how this change can be tested (or why it can't be tested).

🎨 Changes

Add relevant screenshots or videos showcasing the changes.

☑️ Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)