System Appearance Preserved in Generated CSS

Beginning with Version 8.7.0 the user has been able to explicitly set a light or dark appearance for Notenik, overriding whatever the System Setting might be. However, whenever Notenik was generating CSS for use outside of Notenik (or within a sample display.css file), that CSS would still default to the general System appearance. This change fixes that, so that the generated CSS will be based on the user’s current wishes, as expressed by the App Appearance setting on the General tab of the Notenik Preferences.