Adjust default value of "max-recursion-queries"
Since the queries sent towards root and TLD servers are now included in the count (as a result of the fix for CVE-2020-8616), "max-recursion-queries" has a higher chance of being exceeded by non-attack queries. Increase its default value from 75 to 100.
(cherry picked from commit ab0bf492)
Closes #2305 (closed)