graphics/libavif: unbreak fetch

fetch: https://github.com/AOMediaCodec/libavif/commit/2340cdb5f0c2.patch: size mismatch: expected 1712, actual 1714

-index 919f0bc..cb680c3 100644
+index 919f0bc1..cb680c33 100644

(cherry picked from commit 43938a30739d2edbdad9003ccf73959aeb16c309)