Deactivate command works on inactive items

[nus-pe-bot]

Deactivate command still works on prescriptions that have already been made inactive.

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_{[original: nus-cs2113-AY2223S1/pe-interim#1037] [original labels: type.FeatureFlaw severity.Medium]}

[RiaVora]

Team's Response

This is allowed: we want the doctor to be able to ensure that they have de activated something. Performing the command twice has no harm, although one possible improvement could be that we alert the doctor it is already de activated.

Duplicate status (if any):

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