multimedia/svt-av1: unbreak fetch due to tag update
> Fetched file size mismatch (expected 9586152, actual 9585789)
https://gitlab.com/AOMediaCodec/SVT-AV1/-/issues/2136
Reported by: Richard Clayton (via private mail)
(cherry picked from commit f627e2691d27eafdbbb661c58879a757dc5b619a)