chg: test: Bump max-recursion-queries to 100 in resolver system test

With max-recursion-queries set to 50 the resolver system test was
unstable in the "checking query resolution for a domain with a valid
glueless delegation chain" check as ns1 replied with SERVFAIL.

Closes #4897

Merge branch '4897-resolver-ns1-bump-max-recursion-queries-to-100' into 'bind-9.16'

See merge request isc-projects/bind9!9421