Hovering over a message's menu causes call area to resize

### Steps to reproduce

1. Be in a voice/video call with someone.
2. In that chat, hover over a message so its hover menu shows, and then hover over one of the react/reply/reply-in-thread buttons.

### Outcome

#### What did you expect?

The hovered button should highlight and show a tooltip.

#### What happened instead?

The hovered button highlights and shows a tooltip, but the call element in the upper half of the screen becomes maybe 10px wider to the right for a moment, causing the whole page to readjust briefly.

### Operating system

Windows

### Application version

Element version: 1.10.11 Olm version: 3.2.8

### How did you install the app?

installed the desktop app from https://element.io/get-started

### Homeserver

matrix.org

### Will you send logs?

No

No file, test, or entry point is named. First reproduce the resize while hovering the message reaction, reply, or thread buttons during a call on Windows, then trace the affected call area and hover-menu layout. Done means the button still highlights and shows its tooltip without changing the call area's width or shifting the page.

Written by the indexing model from the issue text.