[roles] No config change unless enabled

roles/spotifyd/default.nix

@@ -10,30 +10,31 @@ in
     enable = mkEnableOption "Enable the spotifyd role";
   };
 
-  config = {
-    roles.audio.enable = true;
+  config = mkIf cfg.enable
+    {
+      roles.audio.enable = true;
 
-    services.spotifyd = {
-      enable = true;
-      settings = {
-        global = {
-          use_mpris = false;
-          backend = "alsa";
-          device = "sysdefault";
-          bitrate = 320;
-          cache_path = "";
-          zeroconf_port = 1234;
-          autoplay = false;
+      services.spotifyd = {
+        enable = true;
+        settings = {
+          global = {
+            use_mpris = false;
+            backend = "alsa";
+            device = "sysdefault";
+            bitrate = 320;
+            cache_path = "";
+            zeroconf_port = 1234;
+            autoplay = false;
+          };
         };
       };
-    };
 
-    networking.firewall.allowedTCPPorts = [
-      1234
-      57621
-    ];
-    networking.firewall.allowedUDPPorts = [
-      5353
-    ];
-  };
+      networking.firewall.allowedTCPPorts = [
+        1234
+        57621
+      ];
+      networking.firewall.allowedUDPPorts = [
+        5353
+      ];
+    };
 }