validate: avoid keeping KR_RANK_MISSING
If a sub-query transitions the state to QUERY_DNSSEC_INSECURE, we didn't set correct rank. This lead to caching with _MISSING rank which is too low to be utilized on re-queries. Example: nix.mx query.
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If a sub-query transitions the state to QUERY_DNSSEC_INSECURE, we didn't set correct rank. This lead to caching with _MISSING rank which is too low to be utilized on re-queries. Example: nix.mx query.