[csharp-netcore] Generic Host: Generated Model ctor misses 'this.' references

Description

When generating a csharp-netcore client with the "generichost" library, the resulting constructor doesn't reference its properties correctly, which results in a not functioning ctor, since both property and argument names are the same and no values are getting assigned to the class properties.

i.e.:

        public User(long? id = default, string? username = default, string? firstName = default, string? lastName = default, string? email = default, string? password = default, string? phone = default, int? userStatus = default)
        {
            id = id;
            username = username;
            firstName = firstName;
            lastName = lastName;
            email = email;
            password = password;
            phone = phone;
            userStatus = userStatus;
        }

openapi-generator version

6.0.1

Command line used for generation

java -jar openapi-generator-cli-6.0.1.jar generate \
  -i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/3_0/petstore.yaml \
  -g csharp-netcore \
  -c config.json \
  -o ./client-stub

and here the config.json:

{
	"packageName": "TemplateApi",
	"optionalAssemblyInfo": true,
	"optionalProjectFile": true,
	"targetFramework": "net6.0",
	"modelPropertyNaming": "original",
	"netCoreProjectFile": true,
	"library": "generichost"
}

Steps to reproduce

Generate a sharp-netcore client with "generichost" library ;)

Related issues/PRs

#12793

Start by running the provided openapi-generator command with the generichost configuration and inspect the generated User constructor. Trace the csharp-netcore generichost generation template responsible for that constructor and compare its assignments with the expected property references. Done means generated constructors assign arguments to their corresponding properties rather than to themselves.