fix #774: compile fix for ENABLE_SPLIT_PARALLELISM
m_dLambdaMotionSAD is not an array anymore after JVET_P2001_REMOVE_TRANSQUANT_BYPASS, so just assign it instead of memcpy.
m_dLambdaMotionSAD is not an array anymore after JVET_P2001_REMOVE_TRANSQUANT_BYPASS, so just assign it instead of memcpy.