fix: use strict equality in populateStorage function

Author: jakr-s

debugging/book-library/script.js

@@ -6,7 +6,7 @@ window.addEventListener("load", function (e) {
 });
 
 function populateStorage() {
-  if (myLibrary.length == 0) {
+  if (myLibrary.length === 0) {
     let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
     let book2 = new Book(
       "The Old Man and the Sea",