Rename __tname__ to __tname

[Namek]

HI! I use abstract types in EdgeDB and I cannot deserialize them with the .NET library.

I get an error when I try to query with a __tname__ the following way:

__tname__ := .__type__.name

The exception coming from the database UI itself:

EdgeQLSyntaxError: identifiers surrounded by double underscores are forbidden

Thus, I propose a simple rename that works:

Without it, deserialization fails with an exception: ConfigurationException("Type introspection is required for abstract types, this is a bug.");, defined in the /src/EdgeDB.Net.Driver/Binary/Builders/Info/EdgeDBTypeDeserializerInfo.cs

Lastly, thank you for the great work!