fate: d-cinema-demux: drop unnecessary flags

Signed-off-by: Mans Rullgard <mans@mansr.com>

tests/fate/demux.mak

@@ -14,7 +14,7 @@ FATE_AVCONV += fate-cdxl-demux
 fate-cdxl-demux: CMD = framecrc -i $(SAMPLES)/cdxl/mirage.cdxl -vcodec copy -acodec copy
 
 FATE_AVCONV += fate-d-cinema-demux
-fate-d-cinema-demux: CMD = framecrc -i $(SAMPLES)/d-cinema/THX_Science_FLT_1920-partial.302 -acodec copy -pix_fmt rgb24
+fate-d-cinema-demux: CMD = framecrc -i $(SAMPLES)/d-cinema/THX_Science_FLT_1920-partial.302 -acodec copy
 
 FATE_AVCONV += fate-iv8-demux
 fate-iv8-demux: CMD = framecrc -i $(SAMPLES)/iv8/zzz-partial.mpg -vcodec copy