Multiple scroll bars in latest beta

[st3iny]

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Steps to reproduce

1. Go to a conversation.
2. Compose a very long message (>= 4 lines of text).
3. Observe multiple scroll bars.

It does not matter if the right sidebar is open or not.

Expected behaviour

The outer scrollbar around the conversation should not appear.

Actual behaviour

There appears an outer scrollbar around the conversation which cuts off either the conversation header or message composer.

Diagnosis and logs

Diagnosis report

### Diagnosis report

Nextcloud Talk Desktop
Version	v1.1.2-beta- ()
Built-in Talk version	v21.0.0-rc.2- ()
Release channel	dev
Operating system	Linux 6.6.67-gentoo-x86_64 (#1 SMP PREEMPT Thu Jan 16 13:44:06 CET 2025)
Executable Path	/opt/nextcloud-talk-desktop/Nextcloud Talk
Using Wayland	✅ yes
Connected to	-
Nextcloud server version	31.0.0 RC2
Nextcloud Talk version	21.0.0-rc.2
notifications app enabled	✅ yes
notify_push app enabled	✅ yes

Application config

{
  "launchAtStartup": false,
  "theme": "default",
  "systemTitleBar": true,
  "monochromeTrayIcon": false,
  "zoomFactor": 1,
  "playSoundChat": "respect-dnd",
  "playSoundCall": "respect-dnd",
  "enableCallbox": "respect-dnd"
}

Client logs

Not relevant but can be delivered if required.

[Antreesy]

Upstream regression, was fixed in nextcloud/spreed#14264