[win32] - only allow operating system updates on shutdown/reboot if user has automatic updates configured

Follow up to #5466 - not runtime tested yet (will come to it later the day). Someone needs to find out if we need this or if "SHUTDOWN_INSTALL_UPDATES" really does exactly that. If you ask me - the msdn documentation is a bit unclear about the real behavior.

As stated in the other PR - it would be unacceptable if updates are installed during kodi shutdown or reboot if user has automated update installation truned off in windows control panel.