message: refactor: remove unused variable
diff: @@ -234,7 +234,6 @@ namespace Nextclade {
  }
  void addErrorRow(const std::string& seqName, const std::string& errorFormatted) override {
  - const auto& rowIndex = numRows;
  doc.SetCell(getColumnIndex("seqName"), numRows, seqName);
  doc.SetCell(getColumnIndex("errors"), numRows, errorFormatted);
  ++numRows;
  