vanadium/firefox: simplify google search engine

The old customized config would trigger the bot detection all the time.

nix/configurations/vanadium/home/firefox.nix

@@ -1,7 +1,6 @@
 {
   pkgs,
   config,
-  lib,
   ...
 }: let
   inherit (pkgs) nur;
@@ -11,34 +10,8 @@ in {
 
     policies = {
       SearchEngines = {
-        Default = "Google en@en";
-        Remove = ["Google"];
-        Add =
-          # Google specialized for each language x display language
-          # reference: https://developers.google.com/custom-search/docs/xml_results?hl=zh-tw#advanced-search-query-parameters
-          lib.mapCartesianProduct (
-            {
-              lr,
-              hl,
-            }: let
-              lr' = lib.substring 0 2 (lib.removePrefix "lang_" lr);
-              hl' = lib.substring 0 2 hl;
-            in {
-              Name = "Google ${lr'}@${hl'}";
-              Alias =
-                if lib.removePrefix "lang_" lr == hl
-                then "@G" + lr'
-                else "@G" + lr' + hl';
-              Description = "Your data yum yum (but ${lr'} in ${hl'})";
-              IconURL = "https://google.com/favicon.ico";
-              SuggestURLTemplate = "https://suggestqueries.google.com/complete/search?q={searchTerms}&lr=${lr}&hl=${hl}";
-              URLTemplate = "https://google.com/search?q={searchTerms}&lr=${lr}&hl=${hl}";
-            }
-          ) {
-            lr = ["lang_fr" "lang_en" "lang_zh-TW"];
-            hl = ["fr" "en" "zh-TW"];
-          }
-          ++ [
+        Default = "Google";
+        Add = [
           # Forges
           {
             Name = "GitHub";