fix: don't reset automatically threads list

[DorraJaouad]

☑️ Resolves

• When clicking on thread item and you are not in the same conversation, LS suddenly jumps and shows conversations list with the new conversation joined
• When returning from threads navigation, it feels a bit lost on where you are as thread items don't show which conversation you are in. Best is to return the conversation you were joined in before navigation.

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🏚️ Before	🏡 After
Screenshot before	Screenshot after

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Integrations with Files sidebar and other apps
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required