[ML] Incorrect feature importance visualization for classification

[valeriy42]

Kibana version:

Current main branch. (8.7)

Elasticsearch version:

Current main branch (8.7)

Describe the bug:
When I change the class name in the drop-down menu, the feature importance graph is incorrectly recomputed:

Default class:

Changed class:

The DestCountry feature cannot change the probability to a value over 1.0.

Steps to reproduce:

I used the kbana_sample_data_flights dataset:

{
  "id": "fimps-test-classification",
  "create_time": 1669196535717,
  "version": "8.7.0",
  "authorization": {
    "roles": [
      "superuser"
    ]
  },
  "description": "",
  "source": {
    "index": [
      "kibana_sample_data_flights"
    ],
    "query": {
      "match_all": {}
    },
    "runtime_mappings": {
      "hour_of_day": {
        "type": "long",
        "script": {
          "source": "emit(doc['timestamp'].value.getHour());"
        }
      }
    }
  },
  "dest": {
    "index": "fimps-test-classification",
    "results_field": "ml"
  },
  "analysis": {
    "classification": {
      "dependent_variable": "Cancelled",
      "num_top_feature_importance_values": 5,
      "class_assignment_objective": "maximize_minimum_recall",
      "num_top_classes": -1,
      "prediction_field_name": "Cancelled_prediction",
      "training_percent": 40,
      "randomize_seed": -6164897408045031000,
      "early_stopping_enabled": true
    }
  },
  "analyzed_fields": {
    "includes": [
      "AvgTicketPrice",
      "Cancelled",
      "Carrier",
      "Dest",
      "DestAirportID",
      "DestCityName",
      "DestCountry",
      "DestRegion",
      "DestWeather",
      "DistanceKilometers",
      "DistanceMiles",
      "FlightDelay",
      "FlightDelayMin",
      "FlightDelayType",
      "FlightNum",
      "FlightTimeHour",
      "FlightTimeMin",
      "Origin",
      "OriginAirportID",
      "OriginCityName",
      "OriginCountry",
      "OriginRegion",
      "OriginWeather",
      "dayOfWeek",
      "hour_of_day"
    ],
    "excludes": []
  },
  "model_memory_limit": "31mb",
  "allow_lazy_start": false,
  "max_num_threads": 8
}

[elasticmachine]

Pinging @elastic/ml-ui (:ml)