treewide: remove worldofpeace from meta.maintainers

(It was requested by them.)
I left one case due to fetching from their personal repo:
pkgs/desktops/pantheon/desktop/extra-elementary-contracts/default.nix

pkgs/development/libraries/libwnck/3.x.nix

@@ -71,6 +71,6 @@ stdenv.mkDerivation rec {
     description = "Library to manage X windows and workspaces (via pagers, tasklists, etc.)";
     license = licenses.lgpl21Plus;
     platforms = platforms.linux;
-    maintainers = [ maintainers.worldofpeace ];
+    maintainers = [ ];
   };
 }