shairport working

heard some static noise when listening, maybe something can fix that?

modules/sound/shairport.nix

@@ -2,6 +2,6 @@
   services.shairport-sync = {
     enable = pkgs.stdenv.isLinux;
     openFirewall = pkgs.stdenv.isLinux;
-    arguments = "-v -o pw";
+    arguments = "-v -o pa";
   };
 }