change mpd config to declarative

machines/lucia/configuration.nix

@@ -67,17 +67,17 @@ in
   mpd = {
     enable = true;
     musicDirectory = "/var/lib/mpd/music";
-    extraConfig = ''
-      audio_output {
-        type "alsa"
-        name "My ALSA"
-        device			"hw:0,0"	# optional 
-        format			"44100:16:2"	# optional
-        mixer_type		"hardware"
-        mixer_device	"default"
-        mixer_control	"PCM"
-      }
-    '';
+    settings = {
+      audio_output = [{
+        type = "alsa";
+        name = "My ALSA";
+        device = "hw:0,0";	# optional 
+        format = "44100:16:2";	# optional
+        mixer_type = "hardware";
+        mixer_device = "default";
+        mixer_control = "PCM";
+      }];
+    };
   
     # Optional:
     network.listenAddress = "any"; # if you want to allow non-localhost connections