Switch to bundled packages to fix build.

nix/steam_deck/configuration/roles/spaghettikart/default.nix

@@ -49,6 +49,7 @@ in
           (
             final: prev:
             let
+              modified_package = (pkgs.callPackage ./package/package.nix { });
               optimizeWithFlags =
                 pkg: flags:
                 pkg.overrideAttrs (old: {
@@ -56,12 +57,12 @@ in
                 });
               original_package =
                 if config.me.optimizations.enable then
-                  (optimizeWithFlags prev.spaghettikart [
+                  (optimizeWithFlags modified_package [
                     "-march=znver2"
                     "-mtune=znver2"
                   ])
                 else
-                  prev.spaghettikart;
+                  modified_package;
             in
             {
               spaghettikart = pkgs.buildEnv {
@@ -76,7 +77,7 @@ in
                 ];
                 # We have to use 555 instead of the normal 444 here because the .desktop file ends up inside $HOME on steam deck and desktop files must be either not in $HOME or must be executable, otherwise KDE Plasma refuses to execute them.
                 postBuild = ''
-                  chmod 0555 $out/share/applications/SpaghettiKart.desktop
+                  chmod 0555 $out/share/applications/spaghettikart.desktop
                 '';
               };
             }