Unbreak initial picture placement

Rémi Denis-Courmontrequested to merge
Courmisch/vlc:initplace into master

The picture placement provided by the core is incorrect and, AFAICT, it was never correct since it was introduced. This may affect other video outputs which I did not test, and probably also affects SPU (cc @fcartegnie) which seems to use the same corrupt structure.

Fixes #29386 (closed)

Edited by Rémi Denis-Courmont

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