Wind speed displayed with wrong unit

[Luzifer]

Home Assistant release with the issue:

• Version v0.74.2
• Docker image homeassistant/home-assistant@sha256:3db7271c92eacd17221b9361a2a892d0beef9f9ec19a1109c87dda6cd857cc39
  (pulled as homeassistant/home-assistant:latest)

Component/platform:

OpenWeatherMap

Description of problem:

• Wind speed displayed as km/h while data is delivered in m/s
  
• OpenWeatherMap API documentation
• Current API result

  {
    "cnt": 1,
    "list": [
      {
        "coord": {
          "lon": 9.7,
          "lat": 53.58
        },
        "sys": {
          "type": 1,
          "id": 4901,
          "message": 0.1282,
          "country": "DE",
          "sunrise": 1532662159,
          "sunset": 1532719502
        },
        "weather": [
          {
            "id": 803,
            "main": "Clouds",
            "description": "broken clouds",
            "icon": "04d"
          }
        ],
        "main": {
          "temp": 27.49,
          "pressure": 1012,
          "humidity": 54,
          "temp_min": 27,
          "temp_max": 28
        },
        "visibility": 10000,
        "wind": {
          "speed": 6.2, // <-- Numeric value as in the widget above
          "deg": 60
        },
        "clouds": {
          "all": 56
        },
        "dt": 1532718618,
        "id": 2813464,
        "name": "Wedel"
      }
    ]
  }

• Weather result from Google
  
  (Conversion: 6.2 m/s * 3.6 = 22.32 km/h ~ 19 km/h)