fate: remove unnecessary libavfilter dependency

avconv now requires libavfilter so this dependency is redundant.
Signed-off-by: Mans Rullgard <mans@mansr.com>

tests/fate/video.mak

@@ -118,7 +118,7 @@ fate-frwu: CMD = framecrc -i $(SAMPLES)/frwu/frwu.avi
 FATE_AVCONV += fate-id-cin-video
 fate-id-cin-video: CMD = framecrc -i $(SAMPLES)/idcin/idlog-2MB.cin -pix_fmt rgb24
 
-FATE_AVCONV-$(CONFIG_AVFILTER) += fate-idroq-video-encode
+FATE_AVCONV += fate-idroq-video-encode
 fate-idroq-video-encode: CMD = md5 -f image2 -vcodec pgmyuv -i $(SAMPLES)/ffmpeg-synthetic/vsynth1/%02d.pgm -sws_flags +bitexact -vf pad=512:512:80:112 -f RoQ -t 0.2
 
 FATE_IFF += fate-iff-byterun1