[Bug] Downloader ignoring torrents with multi-episode files

[FlashLightning67]

After the RD refactor, torrents that have multiple episodes in a file have been blacklisted even though they have all the needed episodes. I believe the issue is with line 20 of downloaders/shared.py:

if not needed_media or len(container) >= len([episode for season in needed_media for episode in needed_media[season]]):

The check for if the container has more files than the amount of needed episodes doesn't account for if there are multiple episodes in a single file, so it skips those torrents.

[dreulavelle]

I'm not convinced that the Downloader is the only culprit for this issue. We also need to make sure that symlinking files is also handling this correctly. As well as the symlink library ingestion when a database is reset.