games: Remove xivlauncher

I haven't touched the game in months. Don't really need this anymore.
All it does is add a minute to rebuild time because C# is a piece of
shit that should've never cursed the earth.

modules/desktop/apps/games.nix

@@ -23,7 +23,6 @@
   environment.systemPackages = with pkgs; [
     prismlauncher
     protonup-qt
-    xivlauncher
     osu-lazer-bin
     protontricks
   ];