Restrict the coloring of (Not) VS-NfD Compliant keys to validated keys

Keys that have not been validated, e.g. keys show in the key server
lookup dialog, cannot be checked for VS-NfD compliance.

GnuPG-bug-id: 5388
2 jobs for master in 11 minutes and 8 seconds (queued for 158 minutes and 19 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #100352

00:06:33

passed linux kf5-qt5 qt5.15 #100351

00:04:35

21.0%