Fix #857: Mismatch for filter length derivation of sub-block motion edges.

Brian Hengrequested to merge
bheng/VVCSoftware_VTM:fix_ticket_857 into master
  • Add missing "xEdge is equal to 1" and "yEdge is equal to 1" conditions related to eq. 1255 and 1267 in text.
Edited by Frank Bossen

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