fix : iOS app could not change camera resolutions cause by wrong data type in the video Contraints (#1033)
fix : iOS app could not change camera resolutions cause by wrong data type in the video Contraints (#1033)

_localStream = await navigator.mediaDevices.getUserMedia({
        'audio': true,
        "video": {
          "mandatory": {
            "minWidth": widget.cameraConfig.encodeSettings.width.toString(),
            "minHeight": widget.cameraConfig.encodeSettings.height.toString(),
            "minFrameRate": widget.cameraConfig.fps.toString(),
          },
          "facingMode": "user",
          "optional": [],
        }
      });
flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc