score:4
Turning comments into an answer: As @MJeffryes says, no need to cancel. This is such a minor and clearly inadvertent discrepancy, it is easy to correct in a cover letter. Applications don't get refused for minor errors like this but for fundamental issues. Cancelling and reapplying can lead to more issues, such as the application not being properly withdrawn, and waiting for refunds.
However, in a question Help/Critique: - UK 2yr Visitor Visa (China - Super priority application) from Dec 2022 you describe your relationship as being online only at that time, while in a very recent comment you say that you did not proceed down the visitor visa route. It therefore seems possible that your relationship with your fiancé remains online only. Having met in person is a requirement of paragraph A290 (ii) of the UK’s Immigration Rules pertaining to fiancés and proposed civil partners. Not having met in person prior to submitting your fiancé application would be a fundamental issue that cannot be corrected in a cover letter.