The arguments order is incorrect in 'test_car_logged_when_existing' unit test method. submitted by Joon Joo(J173025)

[hyun31st]

The arguments in self.assertIn(last_line, "NEW-001") are incorrect unless it is testing for students. The following line has the same issue Ref: https://github.com/NM-TAFE/civ-ipriot-in-class-demos/blob/d1d17d06562f77fbdbd54cf1130043450ea48784/assessments/prj/carpark-guide.md?plain=1#L899

[hyun31st]

sorry, just saw it's part of the testing.