[EXPERIMENT] Remove classifier params from NTPArticleSuggestions

testing/variations/fieldtrial_testing_config.json

 {
     "AlternateComponentUrls": [
         {
             "platforms": [
                 "android",
                 "chromeos",
                 "ios",
                 "linux",
                 "mac",
                 "win"
@@ skipping 1358 matching lines @@
         {
             "platforms": [
                 "android"
             ],
             "experiments": [
                 {
                     "name": "EnabledSoftFetches",
                     "params": {
                         "fetching_interval_hours-wifi-active_ntp_user": "8",
                         "scheduler_trigger_types": "persistent_scheduler_wake_up,ntp_opened",
-                        "send_top_languages": "true",
                         "soft_fetching_interval_hours-active-active_ntp_user": "2",
                         "soft_fetching_interval_hours-active-active_suggestions_consumer": "1",
                         "soft_fetching_interval_hours-active-rare_ntp_user": "4"
                     },
                     "enable_features": [
                         "NTPArticleSuggestions"
                     ]
                 }
             ]
         }
@@ skipping 1870 matching lines @@
                 {
                     "name": "Enabled",
                     "enable_features": [
                         "use-new-media-cache"
                     ]
                 }
             ]
         }
     ]
 }