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fix the interaction between JVET_Q0784_LFNST_COMBINATION and JVET_Q0820_ACT/JVET_Q0695_CHROMA_TS_JCCR

Xiaoyu Xiu requested to merge jamesxxiu/VVCSoftware_VTM:LFNST_ACT_BUGFIX into master

In JVET_Q0784_LFNST_COMBINATION, one encoder constraint is applied to disable the chroma transform skip when LFNST is applied to one intra CU. However, the JVET_Q0784_LFNST_COMBINATION macro does not consider the parallel integration of JVET_Q0820_ACT and JVET_Q0695_CHROMA_TS_JCCR where chroma transform skip mode is also applied.

In this MR, the same constraint of JVET_Q0784_LFNST_COMBINATION is appropriately applied to the chroma transform skip checking under JVET_Q0820_ACT and JVET_Q0695_Chroma_TS_JCCR.

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