Editor: do not generate deprecated settings in acsetup.cfg

These are no longer necessary:
- Winsetup are reading these from the pre-loaded game data;
- Other tools may receive these by querying engine with `--tell-gameproperties` command arg.

Editor/AGS.Editor/AGSEditor.cs

@@ -1589,22 +1589,6 @@ public void WriteConfigFile(string configFilePath, bool resetFile = true)
             if (resetFile)
                 Utilities.TryDeleteFile(configFilePath);
 
-            if (_game.Settings.LetterboxMode)
-            {
-                NativeProxy.WritePrivateProfileString("misc", "defaultres", ((int)_game.Settings.LegacyLetterboxResolution).ToString(), configFilePath);
-                NativeProxy.WritePrivateProfileString("misc", "letterbox", "1", configFilePath);
-                NativeProxy.WritePrivateProfileString("misc", "game_width", null, configFilePath);
-                NativeProxy.WritePrivateProfileString("misc", "game_height", null, configFilePath);
-            }
-            else
-            {
-                NativeProxy.WritePrivateProfileString("misc", "defaultres", null, configFilePath);
-                NativeProxy.WritePrivateProfileString("misc", "letterbox", null, configFilePath);
-                NativeProxy.WritePrivateProfileString("misc", "game_width", _game.Settings.CustomResolution.Width.ToString(), configFilePath);
-                NativeProxy.WritePrivateProfileString("misc", "game_height", _game.Settings.CustomResolution.Height.ToString(), configFilePath);
-            }
-			NativeProxy.WritePrivateProfileString("misc", "gamecolordepth", (((int)_game.Settings.ColorDepth) * 8).ToString(), configFilePath);
-
             NativeProxy.WritePrivateProfileString("graphics", "driver", GetGfxDriverConfigID(_game.DefaultSetup.GraphicsDriver), configFilePath);
             NativeProxy.WritePrivateProfileString("graphics", "windowed", _game.DefaultSetup.Windowed ? "1" : "0", configFilePath);
             NativeProxy.WritePrivateProfileString("graphics", "fullscreen",