You lisiting it won't make any difference to your application but it will if you don't mention it and the Home Office find out, even if they only find out years down the line.
Deception to get entry to the UK, even if that crime would not have been a refusal of a visa, is taken very seriously. It is one of the reasons why British citizenship can be removed, even if that visa wasn't used to apply for British citizenship.
Mention it on all future applications too, even if you think it doesn't matter as you have already told them. The latest immigration rule changes are now bringing in a 10 year ban from the UK, for those using/used deception when they apply from inside/to remain in the UK too. I suspect that has more to do with Brexit, but it will catch others too.
Fortunately for those that use uk-yankee, people here always tell others to list everything in applications.