Fix #1391: Resolve issue with MMVD and inter-layer prediction
fix ticket 1391: Unnecessary setting of mrgTypeNeighbours in getInterMergeCandidates() and checking condition in getInterMMVDMergeCandidates()
Edited by Frank Bossen
fix ticket 1391: Unnecessary setting of mrgTypeNeighbours in getInterMergeCandidates() and checking condition in getInterMMVDMergeCandidates()