[bouqueau] fix buffer resources managment when playing content within a scene (previously based on parent scene instead of subscene)
[bouqueau] fix buffer resources managment when playing content within a scene (previously based on parent scene instead of subscene)

DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf