Adjust signal speed restriction timeouts when date or day length changed

src/vehicle.cpp

@@ -4310,4 +4310,7 @@ void ShiftVehicleDates(int interval)
 	for (Vehicle *v : Vehicle::Iterate()) {
 		v->date_of_last_service += interval;
 	}
+
+	extern void AdjustAllSignalSpeedRestrictionTickValues(DateTicksScaled delta);
+	AdjustAllSignalSpeedRestrictionTickValues(interval * DAY_TICKS * _settings_game.economy.day_length_factor);
 }