Like on web: when starting search show all conversations, even when filters are set before

[tobiasKaminsky]

🚧 TODO

• ...

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/27369389667/artifacts/7573840648
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
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[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/27416800051/artifacts/7592666702
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/29019052030/artifacts/8199503887
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)