Enable existing mpd-mpris service declaratively

modules/audio.nix

@@ -102,4 +102,12 @@ in
       bandcamp.identity = bandcamp_token;
     };
   };
+
+  # Interface with Mopidy using MPRIS
+  systemd.packages = [ mpd-mpris ];
+
+  systemd.services.mpd-mpris = {
+    enable = true;
+    wantedBy = [ "multi-user.target" ];
+  };
 }