Add setting for departure boards duration when using minutes

Default to 24 hours

src/settings.cpp

@@ -1272,6 +1272,8 @@ static void UpdateTimeSettings(int32 new_value)
 	SetupTimeSettings();
 	InvalidateVehTimetableWindow(new_value);
 	InvalidateWindowData(WC_STATUS_BAR, 0, SBI_REINIT);
+	InvalidateWindowClassesData(WC_GAME_OPTIONS);
+	InvalidateWindowClassesData(WC_DEPARTURES_BOARD, 1);
 	MarkWholeScreenDirty();
 }