`in: cookie` not properly handled by dart2 templates?

Created by: tek08

https://github.com/OpenAPITools/openapi-generator/blob/ee0686e13f58f1c7029f76bef5c87d547b68f7d5/modules/openapi-generator/src/main/resources/dart2/api_client.mustache#L34

Cookie authentication, I think (correct me if I'm wrong, please, as I'm still learning swagger/generator), is not handled correctly in dart2 templates. Rather than putting Cookie headers in requests back to server, the apiKey gets sent back as a query parameter.