fix mark->title_pkt calculation
fix mark->title_pkt calculation

Azzuro/libbluray,tourettes/libbluray,mwgoldsmith/bluray,mwgoldsmith/bluray,ace20022/libbluray,tourettes/libbluray,ShiftMediaProject/libbluray,ShiftMediaProject/libbluray,ShiftMediaProject/libbluray,ShiftMediaProject/libbluray,mwgoldsmith/bluray,ace20022/libbluray,tourettes/libbluray,Azzuro/libbluray,ace20022/libbluray,Azzuro/libbluray,mwgoldsmith/bluray,Azzuro/libbluray,tourettes/libbluray,ace20022/libbluray