CsvConfiguration is ignored when using CsvHelper for deserialization

When using the CsvHelper serializer, the configuration is used when serializing, but not when deserializing.

Changing the second argument to the constructor to _configuration fixes the problem.

RestSharp/src/RestSharp.Serializers.CsvHelper/CsvHelperSerializer.cs

Line 36 in df07026

using var csvReader = new CsvReader(stringReader, CultureInfo.CurrentCulture);

[alexeyzimarev]

Please open a PR. Thanks in advance.