Edit command can edit a person successfully without any change

[nus-pe-bot]

Input: Edit -p 4 a/Utown Expected: When using edit command to edit a person, if the new input is exactly same as the existed one, it should show an error message or warn. Actual: It shows that the person is edited successfully.

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_{[original: nus-cs2103-AY2223S1/pe-interim#5701] [original labels: type.FeatureFlaw severity.Low]}

[zacchaeuschok]

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