fate: update filter-acrossfade test reference file

<jamrial> durandal_1707: 8088b5d6 broke the acrossfade test
<@durandal_1707> jamrial: there was test?
<jamrial> durandal_1707: fate-filter-acrossfade
<@durandal_1707> what broke?
<jamrial> what used to be one frame is now two
<@durandal_1707> ahh, just update test
Signed-off-by: James Almer <jamrial@gmail.com>

tests/ref/fate/filter-acrossfade

@@ -178,7 +178,8 @@
 0,     174968,     174968,     1024,     4096, 0x74ffeeae
 0,     175992,     175992,      408,     1632, 0x28353dae
 0,     176400,     176400,    88200,   352800, 0x4fb492af
-0,     264600,     264600,     1912,     7648, 0xf0c93a5a
+0,     264600,     264600,      888,     3552, 0xa5a41b07
+0,     265488,     265488,     1024,     4096, 0xc1c61f53
 0,     266512,     266512,     1024,     4096, 0x35b6d595
 0,     267536,     267536,     1024,     4096, 0xc4481118
 0,     268560,     268560,     1024,     4096, 0x5dc0b58d