message: fix: fix crash in dataset list command on macos
diff: @@ -394,7 +394,6 @@ namespace Nextclade {
  auto numTags = std::to_string(datasetRef.versions.size());
  fmt::format_to(buf, " Specific versions ({:}):\n", datasetRef.versions.size());
  - fmt::format_to(buf, " ------------------" + std::string{"-", numTags.size() + 3} + "\n\n");
  for (const auto& version : datasetRef.versions) {
  fmt::format_to(buf, " Version\n");
  