Add new param (fr value) for mail.ru search engine

This is one of request from mail.ru search team to add new param
in search engine fr=ch_omnibox.

Change-Id: Ib0beaa4693c4c5dec7c6f5afc8f49e159a73bf58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3776661
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1026526}

components/search_engines/prepopulated_engines.json

@@ -28,7 +28,7 @@
     // Increment this if you change the data in ways that mean users with
     // existing data should get a new version. Otherwise, existing data may
     // continue to be used and updates made here will not always appear.
-    "kCurrentDataVersion": 131
+    "kCurrentDataVersion": 132
   },
 
   // The following engines are included in country lists and are added to the
@@ -139,7 +139,7 @@
       "name": "@MAIL.RU",
       "keyword": "mail.ru",
       "favicon_url": "https://go.imgsmail.ru/favicon.ico",
-      "search_url": "https://go.mail.ru/search?q={searchTerms}&{mailru:referralID}",
+      "search_url": "https://go.mail.ru/search?q={searchTerms}&{mailru:referralID}&fr=ch_omnibox",
       "alternate_urls": [
         "https://go.mail.ru/msearch?q={searchTerms}&{mailru:referralID}"
       ],