JVET-R0055: Infer chroma scaling matrix to all 16 in 4:0:0

Chen-Yen Lairequested to merge
jennylai/VVCSoftware_VTM:vtm9/JVET-R0055 into master

Set chroma scaling matrices to all 16 by scaling_list_copy_mode_flag

Edited by Xiang Li

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