Steam, the Debian package, showing wrong icon

### What Happened?

The Steam launcher on the Dock is still showing the placeholder `steam-installer` icon (from the Debian package).


### Steps to Reproduce

1. Enable 32-bit packages: `sudo dpkg --add-architecture i386`
2. Install the Steam Installer Debian package: `sudo apt update && sudo apt install steam-installer`
3. Launch Steam once to complete the installation for your user.
4. Log out, then back in — just in case, to reload things.

### Expected Behavior

The application menu shows the correct Steam icon.


### OS Version

8.x (Circe)

### Session Type

Classic Session (X11, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

```shell

```

### Hardware Info

I've rebooted many times already, hoping it would eventually fix itself (some sort of caching, maybe). No change.

- GPU: AMD RX 6600 (open source).