gnome-calendar fix breaks full day events display

[benneti]

While https://github.com/dracula/gtk/commit/b99589e907bb0ca3cca4a335080dfbaecc6a9750 greatly enhances the readability of most of my calendar events, events that are not for the whole day are unreadable now, see screenshot. I think timed events should keep the lighter font color independent of the calendar color.