[EXPERIMENT] Remove params from NTPArticleSuggestions

testing/variations/fieldtrial_testing_config.json

 {
     "AlternateComponentUrls": [
         {
             "platforms": [
                 "android",
                 "chromeos",
                 "ios",
                 "linux",
                 "mac",
                 "win"
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         }
     ],
     "NTPArticleSuggestions": [
         {
             "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"
                     ]
                 }
             ]
         }
     ],
     "NTPBookmarkSuggestions": [
         {
             "platforms": [
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                 {
                     "name": "Enabled",
                     "enable_features": [
                         "use-new-media-cache"
                     ]
                 }
             ]
         }
     ]
 }