Fix sub-account universal transfer history serialization error

[wurdum]

We were testing universal transfer from SPOT Master Account to MARGIN Sub Account and querying results through the following APIs:

• https://binance-docs.github.io/apidocs/spot/en/#universal-transfer-for-master-account
• https://binance-docs.github.io/apidocs/spot/en/#query-universal-transfer-history-for-master-account

After successfully executing transfer using .GeneralApi.SubAccount.TranferSubAccountAsync, calling .GeneralApi.SubAccount.GetUniversalTransferHistoryAsync throws the following exception:

Deserialize Unknown Exception: InvalidOperationException - Sequence contains no matching element 
    at System.Linq.ThrowHelper.ThrowNoMatchException() 
    at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate) 
    at Binance.Net.Converters.BrokerageAccountTypeConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent) 
    at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType) 
    at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType) 
    at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader) 
    at CryptoExchange.Net.BaseApiClient.DeserializeAsync[T](Stream stream, JsonSerializer serializer, Nullable`1 requestId, Nullable`1 elapsedMilliseconds) 

It looks like tests for GetUniversalTransferHistoryAsync were broken. After fixing them, I was able to identify and fix the error: TranferSubAccountAsync uses TransferAccountType for FromAccountType/ToAccountType, but GetUniversalTransferHistoryAsync returns BrokerageAccountType, which later blows the converter.

[JKorf]

Thanks for the PR!