audio-server: use lingering option

modules/audio-server.nix

@@ -166,14 +166,6 @@ in
 
     sound.enable = true;
 
-    # TODO: change to users.k-ot.lingering when updating to 23.11
-    system.activationScripts.enableLingering = lib.optionalString config.services.pipewire.pulse.enable (''
-      rm -r /var/lib/systemd/linger
-      mkdir /var/lib/systemd/linger
-    '' + lib.optionalString config.c3d2.k-ot.enable ''
-      touch /var/lib/systemd/linger/k-ot
-    '');
-
     systemd = {
       services = {
         bluetooth-agent = lib.mkIf config.hardware.bluetooth.enable {
@@ -228,6 +220,7 @@ in
           "pulse-access" # required for system wide pulseaudio
           "rtkit"
         ];
+        linger = true;
         packages = with pkgs; [
           (yt-dlp.override { withAlias = true; })
         ];