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/ruby-modules/solargraph/default.nix

@@ -11,6 +11,6 @@ bundlerApp {
     description = "A Ruby language server";
     homepage = "https://solargraph.org/";
     license = licenses.mit;
-    maintainers = with maintainers; [ worldofpeace nicknovitski angristan ];
+    maintainers = with maintainers; [ nicknovitski angristan ];
   };
 }