Backport of "ges/gstframepositioner: don't create one compositor per frame meta" into 1.20
requested to merge tpm/gstreamer:backport-mr-2623-into-1.20-gesframepositioner-dont-be-stupid into 1.20
Backport of !2623 (merged) "ges/gstframepositioner: don't create one compositor per frame meta".
Commits:
- 4b50e674 ges/gstframepositioner: don't create one compositor per frame meta