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mp4mux: Store samples of the same track in the same trun

Patricia Muscalu requested to merge patricia/gstreamer:fix-qtmux-multiple-samples-in-one-trun into main

It is not wrong to have one trun per sample. However this behaviour is very inefficient. The patch changes as well the content of the first_sample_flags field from 0x40 to 0x80. Without this change the keyframe, is wrongly marked as "not an I picture" according to SS-ISO/IEC 14496-12:2022 (chapter 8.6.4.1). Alternatively, sample_depends_on could be set to 0 (<=> unknown).

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