Inconsistency in command format for add customer test case

[ampan98]

'addcustomer' -> addcustomer

[nus-pe-bot]

This issue is not accepted as it was created/updated outside the PE duration (2021-04-16 14:10:00-2021-04-16 15:48:00).
This issue was created at: 2021-04-16 15:48:48+08:00 and was last updated at 2021-04-16 15:48:48+08:00

If you disagree with the above or have queries, please contact cs2103@comp.nus.edu.sg
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