[DigitallySpeaking] Support uncommon DigitallySpeaking case #28970
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Some rare GDC Vault videos, hosted by DigitallySpeaking, have no speakerVideo element but store the entire video within slideVideo (https://gdcvault.com/play/1016624, https://gdcvault.com/play/1016625, more). Unfortunately, the DigitallySpeaking extractor considers that a fatal error and refuses to download them.
This change accepts videos without either a speakerVideo or a slideVideo element.
This is a repost of #21080 which got kinda nuked in the whole DMCA thing.