fix the interaction between JVET_Q0784_LFNST_COMBINATION and JVET_Q0820_ACT/JVET_Q0695_CHROMA_TS_JCCR
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.