wasmtime{,_36}: use structuredAttrs for both variants

pkgs/by-name/wa/wasmtime/package.nix

@@ -56,6 +56,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "lib"
   ];
 
+  __structuredAttrs = true;
+
   nativeBuildInputs = [
     cmake
     installShellFiles

pkgs/by-name/wa/wasmtime_36/package.nix

@@ -5,8 +5,6 @@
 
 # NOTE: LTS Version EOL August 20 2027
 (wasmtime.override { variant = "lts-36"; }).overrideAttrs (old: {
-  __structuredAttrs = true;
-
   passthru = old.passthru // {
     updateScript = nix-update-script {
       extraArgs = [