Check layer IDs in addition to POCs

Ref pics from L0 and L1 can both be ILRP from different layers. In this case they have the same POC (equals to current POC) but different layer ID. So, they are different pictures.

https://jvet.hhi.fraunhofer.de/trac/vvc/ticket/1567

added 1 commit

• 53912627 - Check pointers to reference pictures

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mentioned in commit 9523f887