fate: fix forgotten hunk for framerate order change in ffmpeg.c

broken by: cbb2c95e
i had fixed that commit but pushed from an old branch

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

tests/ref/fate/zmbv-8bit

-#tb 0: 1000000/70086303
+#tb 0: 15967/1119068
 0,          0,          0,        1,   192000, 0x5234b617
 0,          1,          1,        1,   192000, 0x5234b617
 0,          2,          2,        1,   192000, 0x5234b617