The game defaults to X11 when Wayland is available, but Wayland users would
most likely want to use native Wayland. The wrapper script also updates this
setting, but this patch ensures it works on the first run.

--- a/System/Default.ini
+++ b/System/Default.ini
@@ -157,6 +157,7 @@
 MinDesiredFrameRate=30.0
 Decals=True
 NoDynamicLights=False
+WindowingSystem=SDL3_WINDOWING_SystemPreferred
 
 [Engine.Player]
 ConfiguredInternetSpeed=20000