Update expected output of exercise in episode 6

[abostroem]

The exercise says:

Create a new query base called candidate_join_query_base that combines the WHERE clauses from the previous query with the JOIN clauses for the best neighbor and Pan-STARRS tables. Format the query base using the column names in column_list, and call the result candidate_join_query.
Hint: Make sure you use qualified column names everywhere!
Run your query and download the results. The table you get should have 3725 rows and 9 columns.

We need to update the number of rows to 4300