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videoflip: fix concurrent access when modifying the tag list

Guillaume Desmottes requested to merge gdesmott/gstreamer:videoflip into main

We were checking if the tag list is writable, but it may actually be shared through the same event (tee upstream or multiple consumers).

Fix a bug where multiple branches have a videoflip element checking the taglist. The first one was changing the orientation back to rotate-0 which was resetting the other instances.

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