refactor(book-form): remove unused onCancel prop

Author: ArnauACR

src/components/BookForm.jsx

@@ -1,7 +1,7 @@
 import { useState, useEffect } from 'react';
 import styles from './BookForm.module.css';
 
-const BookForm = ({ book, onSubmit, onCancel }) => {
+const BookForm = ({ book, onSubmit }) => {
   const [formData, setFormData] = useState({
     title: '',
     author: '',