libmpeg2: Fix Closed Captions in GOP.
This fixes a case where our libmpeg2 module was not extracting Closed Captions from the user_data, when this user_data was in the GOP header, instead of in the picture header. This information is retained until the next picture (date) is handled. See sample "bob-dvd-closedcaptioning works in ffmpeg but not in libmpeg2.ts"
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