Request the dedicated GPU when starting Xonotic from the `.desktop` file
See <https://www.hadess.net/2020/05/dual-gpu-support-launch-on-discrete-gpu.html> for more information about this newly added `.desktop` entry property.
See merge request xonotic/xonotic!66
Icon=xonotic
Exec=xonotic-glx
Terminal=false
+PrefersNonDefaultGPU=true
StartupNotify=false
Categories=Game;ActionGame;
Icon=xonotic
Exec=xonotic-sdl
Terminal=false
+PrefersNonDefaultGPU=true
StartupNotify=false
Categories=Game;ActionGame;