codec: libass: pass storage size to libass
Due to a quirk in the ASS format some tags do depend on the exact storage size of the video not just the pixel aspect ratio, so tell libass via ass_set_storage_size to achieve correct rendering. For ASS, storage size refers to the size the video is encoded in (stored at) with codec-level crop applied; further transforms like e.g. anamorphic de-squeezing or container-level crop must not be applied. This matches the used fmt_src values despite them being named visible_{width,height} and the existing PAR calculation already relies on this. Fixes videolan/vlc#26634 (cherry picked from commit 2608eb5c)
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