[Bug]: ALSA apps will always use Pulseaudio device instead of Pipewire

[CogumeloNoGIT]

Checklist

• [x] I agree to follow the Code of Conduct that this project adheres to.
• [x] I have searched the issue tracker for a bug that matches the one I want to file, without success.
• [x] If this is an issue with a particular app, I have tried filing it in the appropriate issue tracker for the app (e.g. under https://github.com/flathub/) and determined that it is an issue with Flatpak itself.
• [x] This issue is not a report of a security vulnerability (see here if you need to report a security issue).

Flatpak version

1.16.1

What Linux distribution are you using?

Arch Linux

Linux distribution version

No response

What architecture are you using?

x86_64

How to reproduce

Disable Pulseaudio sound server, allow access to xdg-run/pipewire-0 and try to use pipewire-alsa plugin.

Expected Behavior

Play the audio through pipewire-alsa.

Actual Behavior

The default ALSA device is Pulseaudio. Unless the app have a ALSA device selector to choose Pipewire device like Osu! or MPV, it'll fail.

Additional Information

Can't get pipewire-alsa working on most of Flatpak apps because of the default device.