Duplicate tags on patient is allowed

[nus-pe-bot]

The add command allows for adding duplicate tags but with different casing eg: Diabetic and diabetic, while they are supposed to mean the same thing.

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_{[original: nus-cs2103-AY2425S1/pe-interim#3531] [original labels: type.FeatureFlaw severity.Low]}

[itsnotsherm]

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