Sweep: Fix incorrect use of new

[sweep-ai[bot]]

PR Feedback: 👍

Description

This pull request addresses a syntax error in the instantiation of a new `Book` object within the `POST /books` route. The incorrect use of curly braces `{}` when passing parameters to the `Book` constructor has been corrected to use parentheses `()`.

# Summary
- Corrected the syntax for creating a new `Book` instance in `app.js`.
- Ensured that the `Book` object is properly instantiated with the provided `title`, `author`, `year`, `category`, and `cover` from the request body.

Fixes #31.

---

🎉 Latest improvements to Sweep:

• New dashboard launched for real-time tracking of Sweep issues, covering all stages from search to coding.
• Integration of OpenAI's latest Assistant API for more efficient and reliable code planning and editing, improving speed by 3x.
• Use the GitHub issues extension for creating Sweep issues directly from your editor.

---

💡 To get Sweep to edit this pull request, you can:

• Comment below, and Sweep can edit the entire PR
• Comment on a file, Sweep will only modify the commented file
• Edit the original issue to get Sweep to recreate the PR from scratch

This is an automated message generated by Sweep AI.

[sweep-ai[bot]]

Rollback Files For Sweep

• [ ] Rollback changes to app.js

This is an automated message generated by Sweep AI.

[sweep-ai[bot]]

Apply Sweep Rules to your PR?

• [ ] Apply: All docstrings and comments should be up to date.
• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

This is an automated message generated by Sweep AI.