amule-daemon: migrate to by-name

pkgs/by-name/am/amule-daemon/package.nix

@@ -0,0 +1,13 @@
+{
+  amule,
+  ...
+}@args:
+
+amule.override (
+  {
+    monolithic = false;
+    enableDaemon = true;
+    mainProgram = "amuled";
+  }
+  // removeAttrs args [ "amule" ]
+)

pkgs/top-level/all-packages.nix

@@ -1446,12 +1446,6 @@ with pkgs;
 
   crystfel-headless = crystfel.override { withGui = false; };
 
-  amule-daemon = amule.override {
-    monolithic = false;
-    enableDaemon = true;
-    mainProgram = "amuled";
-  };
-
   amule-gui = amule.override {
     monolithic = false;
     client = true;