audio: use pulseaudioFull package to not build from source

modules/audio.nix

@@ -23,7 +23,12 @@ in
       pavucontrol
     ]);
 
-    hardware.pulseaudio.zeroconf.discovery.enable = true;
+    hardware.pulseaudio = {
+      # enabling zeroconf discovery or publishing turns on zeroconfSupport for the configured pulseaudio package
+      # pulseaudioFull has that enabled plus it has a cache hit on cache.nixos.org
+      package = pkgs.pulseaudioFull;
+      zeroconf.discovery.enable = true;
+    };
 
     # required for paprefs to be able to save
     programs.dconf.enable = lib.mkIf config.services.xserver.enable true;