fix: Fixed contacts.update when received changed picture event (close #931)

[icleitoncosta]

I was running some tests with Baileys and noticed this simple bug.
They previously fixed the processProfilePic function, but when receiving the contact update event, the ID that came was blank.

By making this simple fix, the event was corrected.

Cited in #931

[whiskeysockets-bot]

Thanks for your contribution.

The next step is to wait for review and approval to merge it to main repository

The community can help reacting with a thumb up (:thumbsup:) for approval and rocket (:rocket:) for who has tested it.

To test this PR you can run the following command below:

# NPM
npm install @whiskeysockets/baileys@icleitoncosta/Baileys#picture-ev
# YARN v2
yarn add @whiskeysockets/baileys@icleitoncosta/Baileys#picture-ev