Fix #356: fix value of SPS::m_numRPL0/1
Set SPS::m_numRPL0/1 equal to num_ref_pic_lists_in_sps instead of num_ref_pic_lists_in_sps + 1. This allows to align the parsing of slice_header with specification when getNumRPL0() or getNumRPL1() are called (correspond to the condition on num_ref_pic_lists_in_sps in the specfication).
Edited by Remy Foray