fix(chats): Don't mark conversation unread when receiving a reaction …

[nickvergessen]

…notification

☑️ Resolves

• Fix Reaction to message shows as unread message of a conversation in left sidebar #9134

Steps

1. User 1: Write a message in Talk room
2. User 1: Open talk homepage
3. User 2: React to the message from 1.
4. User 1: Between the time the notifications refresh and the conversation list refreshes, see the chat as unread with counter "(1)" and subline being "User 2:" + your chat message

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not required
• 📘 API documentation in docs/ has been updated or is not required
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required
• 🔖 Capability is added or not needed

[Antreesy]

Tested on Chrome for one-to-one chats and always-notify group chats, works properly

[nickvergessen]

/backport to stable26