message: fix: don't exclude reversions of deletions
  This was incorrectly conditionally excluding reversions of deletions, even though we specifically looking for them inside the conditional block
diff: @@ -236,7 +236,7 @@ namespace Nextclade {
  for (const auto& [pos, nodeQueryNuc] : nodeMutMap) {
  const bool seqHasMutOrDel = has(seqPositionsMutatedOrDeleted, pos);
  const bool isSequenced = isSequencedGeneric(pos, seq, LetterTag<Letter>{});
  - if (!seqHasMutOrDel && isSequenced && !isGap(nodeQueryNuc)) {
  + if (!seqHasMutOrDel && isSequenced) {
  // Case 4: Mutation in node, but not in sequence. This is a so-called reversion. Mutation in sequence reverts
  // the character to ref seq.
  // Action: Add mutation from node query character to character in reference sequence.
  