fix: Ch2 Q1 answer check

The question suggests that the word count of the response should be evaluated but the character count is checked instead.

app.py

@@ -350,7 +350,7 @@ challenges = [
             {
                 "title": "Question 1. Length of Prime",
                 "description": "Craft a question with word count of a prime number, that prompts a response whose word count is exactly its succeeding prime number.",
-                "validator": lambda response, input: is_prime(len(input.split())) and len(response) == next_prime(len(input.split()))
+                "validator": lambda response, input: is_prime(len(input.split())) and len(response.split()) == next_prime(len(input.split()))
             },
             {
                 "title": "Question 2.  Larger as we speak",