[NixOS] [Emacs] Use tree sitter/native compilation flags for emacs everywhere

nixos/essential.nix

@@ -19,10 +19,7 @@ in
 
   environment.systemPackages = with pkgs; [
     python-with-my-packages
-    (emacs29.override {
-      withNativeCompilation = true;
-      withTreeSitter = true;
-    })
+    emacs
 
     automake
     bazel

nixos/overlay.nix

@@ -33,4 +33,9 @@ final: prev: {
       hash = "sha256-HXkVjdAdmSQx3S4/rLif2slxJ/iXhOosthDGAPsMFIM=";
     };
   });
+
+  emacs = prev.emacs29.override {
+    withNativeCompilation = true;
+    withTreeSitter = true;
+  };
 }