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Scaling cleanup

Renjie Chang requested to merge renjiechang/VVCSoftware_VTM:scaling_cleanup into VTM-11.0_nnvc

According to buffer_blending = w * buffer_CNN + (1-w) * buffer_DBF in the scaling mode, only CNN buffer is processed when scale factor equals 1. But when scaling mode is not enabled, also only CNN buffer is processed. Thus, the scaling factor 1 is redundant and need to be removed.

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