Remove duplicate function calls

[tgreenx]

Purpose

This PR removes two duplicate function calls. The first calls are made several lines above. This looks like it was a mistake after a mixup between two commits: 72f1ec2 and 3985220 in release v2024.2.

How to test this PR

Tests should pass.
With manual testing, undelegated tests should still work:

$ zonemaster-cli --level INFO --ns ns2.nic.fr zonemaster.net --test basic --show-testcase --no-ipv6

Seconds Level    Testcase       Message
======= ======== ============== =======
   0.00 INFO     Unspecified    Using version v7.0.0 of the Zonemaster engine.
   0.00 INFO     Basic01        The zone "zonemaster.net" is found.
   0.00 INFO     Basic01        This is a test of an undelegated domain so finding the parent zone is disregarded.
   0.04 INFO     Basic02        Authoritative answer on SOA query for "zonemaster.net" is returned by name servers "ns2.nic.fr/192.93.0.4".
   0.04 INFO     Unspecified    Functional nameserver found. "A" query for www.zonemaster.net test skipped.