Fix for ticket #1391: Unnecessary setting of mrgTypeNeighbours
fix ticket 1391: Unnecessary setting of mrgTypeNeighbours in getInterMergeCandidates() and checking condition in getInterMMVDMergeCandidates()
fix ticket 1391: Unnecessary setting of mrgTypeNeighbours in getInterMergeCandidates() and checking condition in getInterMMVDMergeCandidates()