same picture check in HMVP mismatch with software

[wchien]

when HMVP is used in MVP generation, same reference picture is checked whether the signal reference picture is the same as reference picture in HMVP. VVC is checking whether POC of the reference pictures are the same, but spec if checking whether reference index.

In 8.4.2.9,
6......
– The LY reference index of the history-based motion vector predictor candidate HmvpCandList[i] is equal to refIdxLX

should change to
– The LY reference index refIdxLY of the history-based motion vector predictor candidate HmvpCandList[i] and refIdxLX should match the following conidtion :

DiffPicOrderCnt( refPicListY[ refIdxLY], RefPicListX[ refIdxLX ] ) = 0

[WJ: condition is wrong, it should be POC based, eg. DiffPicOrderCnt( refPicListY[ refIdxLY], RefPicListX[ refIdxLX ] ) is equal to 0

[wchien]

assigned wrong component.