Export tests: pin the H.264 bytes FilmCraft 09aaf9b writes (#1701)

The encoder's first-frame user_data_unregistered SEI now lists its settings
("... - options: rc=vbr bitrate=10000 ... scenecut=1", 211 bytes where
"filmcraft-h264enc 0.1.1 - clean-room H.264 encoder" took 50): +161 bytes.
The same build gives (104322, 11051847956767423392), the pin Linux CI took on
a base before the 19-byte nclx colr box, when that box is left out, so the
bytes match across platforms.

crates/export/tests/it/movie_bytes.rs

@@ -94,7 +94,7 @@ fn export_bytes(format: OutputFormat, name: &str) -> Vec<u8> {
 #[test]
 fn h264_movie_bytes_are_pinned() {
     let data = export_bytes(OutputFormat::H264, "/out/pinned.mp4");
-    assert_eq!((data.len(), fnv1a(&data)), (104_180, 8_728_430_532_616_484_528), "H.264 MP4");
+    assert_eq!((data.len(), fnv1a(&data)), (104_341, 17_655_680_090_264_218_914), "H.264 MP4");
 }
 
 #[test]