[Bug]: It won't record system sound in Linux App image.

[Basharkhan7776]

Describe the bug
While I select the system recording in dialog and mute mic, after recording in editor window system sound is not played and after export as media player as well.

To Reproduce
Steps to verify on linux machine:

1. Run the latest published image and make it executable.
2. In record dialog click on mic button.
3. Enable system audio and record video with system audio.
4. Save and play the preview, export as media and play in media player.