This seems to be a mistake and is inconsistency with ::loadGroups() in pastedialog.cpp and torrentcreatordlg.cpp
The standard groups (Active uploads, Active downloads etc.) are formed automatically and choosing them in fileselectdlg.cpp gives nothing except a warning message like
"RTTI symbol not found for class 'kt::FunctionGroup<&(bool kt::member<&kt::not_running, &kt::download>(bt::TorrentInterface*))>'"
in stderr.
This patch hides them from the list of available groups. Only "All Torrents" (default, hardcoded) and groups with CUSTOM_GROUP flag (if any) shall be displayed.