Gamescope doesn't work in Desktop Mode

[inXayn]

After several hours of research, I guess it's because of the currently installed `gamescope` 3.13.7-2 version. It should be fixed with 3.13.8, which was released on Nov 21, 2023.

See: https://github.com/ValveSoftware/gamescope/issues/1022

I tested `gamescope -- glxgears` in the terminal which should display a little window, that you could see if you run `glxgears` without gamescope.

Interestingly it doesn't crash if you also use the -e parameter for gamescope, but then it simply runs in an invisible xwayland window. You can run a steam game this way too, then it doesn't instantly crash but stays in an invisible xwayland window.

If I then run `set DISPLAY :1` and `xrandr --listmonitors` it gives me the output:
0: +XWAYLAND0 1280/339x720/190+0+0 XWAYLAND0
so gamescope is creating the window but it is invisible.

[ladycocothewise]