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/data/fonts/open-sans/default.nix

@@ -26,6 +26,6 @@ in fetchFromGitLab {
     homepage = "https://www.opensans.com";
     license = licenses.asl20;
     platforms = platforms.all;
-    maintainers = [ maintainers.worldofpeace ];
+    maintainers = [ ];
   };
 }

pkgs/data/themes/adwaita-qt/default.nix

@@ -36,7 +36,7 @@ mkDerivation rec {
     description = "A style to bend Qt applications to look like they belong into GNOME Shell";
     homepage = "https://github.com/FedoraQt/adwaita-qt";
     license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ worldofpeace ];
+    maintainers = with maintainers; [ ];
     platforms = platforms.linux;
   };
 }