CheckBox and RadioButton ignore BackColor and ForeColor when Appearance=Button in Dark Mode

### .NET version

.NET 11.0.100-rc.1.26404.113

### Did it work in .NET Framework?

Not tested/verified

### Did it work in any of the earlier releases of .NET Core or .NET 5+?

No, this issue also repro on .NET10

### Issue description

When `CheckBox.Appearance` or `RadioButton.Appearance` is set to `Appearance.Button`,
custom `BackColor` and `ForeColor` values are ignored in Dark Mode.
The controls are rendered using the system button theme colors instead of the user-specified colors.

Regular `Button` controls honor the same color settings correctly.

### Steps to reproduce

1. Create a WinForms .NET application with RadioButton/CheckBox control
2. Set RadioButton/CheckBox's `Appearance`is Button
3. Custom RadioButton/CheckBox's BackColor and ForeColor
4. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file
5. Run the application to observe