[Unknown Mod][Castles] Add the possibility to choose directly between Red Dragon and Black Dragon in the creature upgrade window

[LeHerosInconnu]

Add the possibility to choose directly between Red Dragon and Black Dragon in the creature upgrade window (depending on the possibilities).

In fheroes2:

2022-05-30.12-38-12.mp4

Here is the save file:
Upgrade dragons 01.zip

This is not an option.
This can be implemented directly in fheroes2.