Fixing Errors with deleteUser function

[aditya-an1l]

Error: I ran the code, and the DELETE request returned a dubious json message like Username undefined with ID undefined deleted

Reason: Possibly some changes in the newer versions of Node or dependencies packages

Changes: Changed the result in the deleteUser code block. Instead of Username ${result.username} with ID ${result._id} deleted, I used Username ${user.username} with ID ${user._id} deleted