add user={undefined} to UserProfile.js

[andriusmv]

What: add user={undefined} to user (line 2 of file "UserProfile.js")
Where: UserProfile.js
Why: to avoid TypeError: Cannot read properties of undefined (reading 'photoURL'), (reading 'username') and (reading 'displayName').

Code should look like this:

// UI component for user profile
export default function UserProfile({ user={undefined} }) {
  return (
    <div className="box-center">
      <img src={user.photoURL || '/hacker.png'} className="card-img-center" />
      <p>
        <i>@{user.username}</i>
      </p>
      <h1>{user.displayName || 'Anonymous User'}</h1>
    </div>
  );
}

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