Footer file name is not updated to app name

[nus-se-script]

Footer file name is still addressbook.json, which may confuse the user if they do not know what is addressbook. It should be something like teamtracker.json instead

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_{[original: nus-cs2103-AY2324S2/pe-interim#1933] [original labels: type.FeatureFlaw severity.VeryLow]}

[breezetall]

Team's Response

There is no requirement to change the name of the save file. Furthermore, we are still using the addressbook.json to save contacts and a separate tasklist.json to save tasks.

Duplicate status (if any):

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