Enable Dark Modes cannot be undone from the GUI

[bit-becker]

Steps to reproduce:

• Run Fixer with "Enable Dark Mode for Apps" and "Enable Dark Mode for System" checked.
• Now dark themes are turned on.

If user changes their mind and wants to instead use Light Themes there is no way to do this from the GUI.
The user must manually edit the registry setting to revert back to using Light Themes.

• @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize\AppsUseLightTheme" = 1
• @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize\SystemUsesLightTheme" = 1

Please add (toggle?) options "Enable Light Theme for Apps" or "Enable Light Theme for System" to allow the registry setting to revert back to Light Themes.