Missing files in DF40

[bobo0214]

Thanks for the dataset!
After comparing the files with the entries in the json, I found that:

1. there are only videos in the fake folder in ‘heygan’, there is no preprocessed frames folder
2. the real folder is missing in ‘CollabDiff’
3. there is only inversion folder in ‘e4e/ff’, but the json provides a digital folder for xxx