packetizer: vc1: fix CC extraction
packetizer: vc1: fix CC extraction

Should strip ep3b escaping and drop the trailing 0x80

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc