Cannot run Element as root

### Steps to reproduce

Launch as root Element with `--no-sandbox` because of electron:
>Running as root without `--no-sandbox` is not supported.

### Outcome

#### What did you expect?
To be able to run Element as root.
#### What happened instead?
Element doesn't start, I can see a lot of errors with:
`FATAL:electron_main_delegate.cc(252)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.`

### Operating system

Debian 11

### Application version

Version 1.9.4

### How did you install the app?

https://flathub.org/apps/details/im.riot.Riot

### Homeserver

matrix.org

### Will you send logs?

I can't now eventually yes.

Start by reproducing the launch failure on Debian 11 using the Flathub installation and the reported --no-sandbox setting. Review the Electron startup path and the reported root-user error, then determine whether root execution is supported; done means the supported behavior is documented or the application starts without the reported failure.

Written by the indexing model from the issue text.