Fixed issue with generics formatters generation - #1534

[MessagePackObject]
public class ClassA<T>
{
    [Key(0)]
    public readonly T Field { get; set; }
}

[MessagePackObject]
public class ClassB<T>
{
    [Key(0)]
    public List<ClassA<T>> Field { get; set; }
}

[MessagePackObject]
public class ClassC
{
    [Key(0)]
    public ClassB<float> Field {get;set;}
}

internal static class GeneratedResolverGetFormatterHelper
{
    private static readonly global::System.Collections.Generic.Dictionary<global::System.Type, int> lookup;

    static GeneratedResolverGetFormatterHelper()
    {
        lookup = new global::System.Collections.Generic.Dictionary<global::System.Type, int>(5)
        {
            { typeof(global::System.Collections.Generic.List<global::Ti.ClassA<float>>), 0 },
            { typeof(global::System.Collections.Generic.List<global::Ti.ClassA<T>>), 1 },
            { typeof(global::Ti.ClassA<float>), 2 },
            { typeof(global::Ti.ClassB<float>), 3 },
            { typeof(global::Ti.ClassC), 4 },
        };
    }

    internal static object GetFormatter(global::System.Type t)
    {
        int key;
        if (!lookup.TryGetValue(t, out key))
        {
            return null;
        }

        switch (key)
        {
            case 0: return new global::MessagePack.Formatters.ListFormatter<global::Ti.ClassA<float>>();
            case 1: return new global::MessagePack.Formatters.ListFormatter<global::Ti.ClassA<T>>();
            case 2: return new MessagePack.Formatters.Ti.ClassAFormatter<float>();
            case 3: return new MessagePack.Formatters.Ti.ClassBFormatter<float>();
            case 4: return new MessagePack.Formatters.Ti.ClassCFormatter();
            default: return null;
        }
    }
}

internal static class GeneratedResolverGetFormatterHelper
{
    private static readonly global::System.Collections.Generic.Dictionary<global::System.Type, int> lookup;

    static GeneratedResolverGetFormatterHelper()
    {
        lookup = new global::System.Collections.Generic.Dictionary<global::System.Type, int>(4)
        {
            { typeof(global::System.Collections.Generic.List<global::Ti.ClassA<float>>), 0 },
            { typeof(global::Ti.ClassA<float>), 1 },
            { typeof(global::Ti.ClassB<float>), 2 },
            { typeof(global::Ti.ClassC), 3 },
        };
    }

    internal static object GetFormatter(global::System.Type t)
    {
        int key;
        if (!lookup.TryGetValue(t, out key))
        {
            return null;
        }

        switch (key)
        {
            case 0: return new global::MessagePack.Formatters.ListFormatter<global::Ti.ClassA<float>>();
            case 1: return new MessagePack.Formatters.Ti.ClassAFormatter<float>();
            case 2: return new MessagePack.Formatters.Ti.ClassBFormatter<float>();
            case 3: return new MessagePack.Formatters.Ti.ClassCFormatter();
            default: return null;
        }
    }
}