Types without extension methods should remain nested UserQuery

[atifaziz]

The following LINQPad program query:

void Main()
{
    Print(NestedClass.StaticMethod      );
    Print(NestedStruct.StaticMethod     );
    Print(NestedStaticClass.StaticMethod);
    Print(default(object).Extension     );
    Print(Extensions.StaticMethod       );
}

static void Print(Action a) =>
    Console.WriteLine($"{a.Method.DeclaringType.FullName}::{a.Method.Name}");

struct NestedStruct
{
    public static void StaticMethod() {}
}

class NestedClass
{
    public static void StaticMethod() {}
}

static class NestedStaticClass
{
    public static void StaticMethod() {}
}

static class Extensions
{
    public static void StaticMethod() {}
    public static void Extension<T>(this T _) {}
}

displays the following in LINQPad (tested with version 6):

UserQuery+NestedClass::StaticMethod
UserQuery+NestedStruct::StaticMethod
UserQuery+NestedStaticClass::StaticMethod
Extensions::Extension
Extensions::StaticMethod

When run with LINQPadless, this produces:

NestedClass::StaticMethod
NestedStruct::StaticMethod
NestedStaticClass::StaticMethod
Extensions::Extension
Extensions::StaticMethod

Tested with version at 27c3fb6.