chore: Update pipewire conf & add kpipewire

- Enable system-wide audio in Pipewire service
- Add kpipewire package to environment system packages

os-mods/desktop/audio.nix

@@ -5,6 +5,8 @@
 }: {
   services.pipewire = {
     enable = true;
+    # systemWide = true;
+    audio.enable = true;
     alsa.enable = true;
     alsa.support32Bit = true;
     pulse.enable = true;
@@ -23,4 +25,8 @@
       "bluetooth.autoswitch-to-headset-profile" = false;
     };
   };
+
+  environment.systemPackages = with pkgs; [
+    kdePackages.kpipewire # TODO Check if needed
+  ];
 }