fix: relink the X11 socket into place if needed

Fixes X11 applications on tmp-as-tmpfs setups.

modules/wsl-distro.nix

@@ -124,6 +124,10 @@ with lib; {
 
             # Don't allow emergency mode, because we don't have a console.
             enableEmergencyMode = false;
+
+            # Link the X11 socket into place. This is a no-op on a normal setup,
+            # but helps if /tmp is a tmpfs or mounted from some other location.
+            tmpfiles.rules = [ "L /tmp/.X11-unix - - - - /mnt/wslg/.X11-unix" ];
           };
 
           # Start a systemd user session when starting a command through runuser