Fixed: Use Nzb title as scene name when available

- Use Nzb title as scene name when available
- Only use file name as scene name when its highly likely that it's an actual scene name
- Don't store `DRONE` as default release group in the DB
- Clean up the db removing obviously wrong scene names


40 seems pretty arbitrary, if this is meant to catch hashed releases, those would already be handled with `OR SceneName NOT LIKE '%.%'")`