packages-config: drop versioned emacsPackages alias

As of https://github.com/NixOS/nixpkgs/pull/188110, emacsPackages isn't an alias
anymore and is automatically recursed into.

pkgs/top-level/all-packages.nix

@@ -27939,6 +27939,7 @@ with pkgs;
   };
 
   # This alias should live in aliases.nix but that would cause Hydra not to evaluate/build the packages.
+  # If you turn this into "real" alias again, please add it to pkgs/top-level/packages-config.nix again too
   emacsPackages = emacs.pkgs;
 
   inherit (gnome) empathy;

pkgs/top-level/packages-config.nix

@@ -45,8 +45,5 @@
     haskell = super.haskell // {
       compiler = recurseIntoAttrs super.haskell.compiler;
     };
-
-    # This is an alias which we disallow by default; explicitly allow it
-    emacs28Packages = emacs28.pkgs;
   };
 }