Fix eDVBPVRServiceOfflineOperations::reindex()

(used by the ReconstructScAp plugin)

869a8d0cee9c39a8c4b3baca9a6355ed505a27b6 broke
eDVBPVRServiceOfflineOperations::reindex, which relies
on eMPEGStreamParserTS::setPid to autodetect the
streamtype, when the streamtype argument equals -1