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Fix: Wrong MVP_L1 of SMVD derived in MVD sign prediction, when JVET_Z0054_BLK_REF_PIC_REORDER macro is enabled

Chun-Chi Chen requested to merge chunchic/ecm-4:JVET-Z0054-RefPicReorder-WrongMv1ForSMVD into master

When reference picture reordering macro is enabled, the MVD sign prediction funciton (i.e., InterPrediction::deriveMvdSignSMVD) of SMVD mode refers to the AMVP list "L0" to derive MVP L1 and then reconstruct MV_L1, resulting in a wrong MV_L1 used to perform MVD sign prediction.

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