graphics/libavif: unbreak fetch due to repo growth

fetch: https://github.com/AOMediaCodec/libavif/commit/2340cdb5f0c2.patch: size mismatch: expected 1714, actual 1716

-index 919f0bc1..cb680c33 100644
+index 919f0bc14..cb680c335 100644

(cherry picked from commit 9fd5233569f6b7525a25374c771128c2caed0409)