Fix detection in "wordlist-validator.yml" pipeline.

Describe the bug:

The "wordlist-validator.yml" github action will often issue warnings for non-existent lines. For example, run https://github.com/danielmiessler/SecLists/actions/runs/13662391891 issued a warning for line 114444 of Discovery/DNS/subdomains-top1million-110000.txt, but that file only has 114443 lines.