[soundcloud] Fix paged playlist download archival

[CoryDHall]

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rel: #19022

Paged playlists do not work as intended with --download-archive. This attaches missing data by considering additional information already present in the collection.

[leonklingele]

Works for me 👍

[CoryDHall]

@dstftw

Sorry for the sloppy code, I'm not super familiar with python conventions, and some of the patterns in this extractor are kind of strange