fix: Correct logic in delete_username_proof_transaction to delete instead of re-adding

[Himess]

Why is this change needed?

The current implementation of the delete_username_proof_transaction function incorrectly re-adds the username proof after encoding it instead of deleting it. This PR corrects that logic by replacing the re-add operation with the proper deletion operation. It ensures that the function now correctly removes the username proof from the database when called, fixing the logic and ensuring the expected behavior.

Merge Checklist

• PR title adheres to the conventional commits standard
• PR has a changeset
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PR-Codex overview

This PR focuses on modifying the handling of a primary key in the name_registry_events.rs file, specifically changing how data is stored in a transaction.

Detailed summary

• Removed the line that puts the primary_key into the transaction (txn.put(primary_key.clone(), buf);).
• Added a line that deletes the primary_key from the transaction (txn.delete(primary_key);).

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Latest commit: c74dceb

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