message: Remove extra extension register
  Since the extension now services http and https, I think that it only needs to be registered once.
diff: @@ -8,7 +8,6 @@ void HTTPFsExtension::Load(DuckDB &db) {
  S3FileSystem::Verify(); // run some tests to see if all the hashes work out
  auto &fs = db.instance->GetFileSystem();
  fs.RegisterSubSystem(make_unique<HTTPFileSystem>());
  - fs.RegisterSubSystem(make_unique<HTTPFileSystem>());
  fs.RegisterSubSystem(make_unique<S3FileSystem>(*db.instance));
  }
  