fate/mpegps: Fix argument order

Regression since fb548fba.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/fate/mpegps.mak

 # This tests that a 16-bit pcm_dvd stream is correctly remuxed in mpegps
 FATE_MPEGPS-$(call DEMMUX, MPEGPS, MPEG1SYSTEM) += fate-mpegps-remuxed-pcm-demux
 fate-mpegps-remuxed-pcm-demux: $(SAMPLES)/mpegps/pcm_aud.mpg
-fate-mpegps-remuxed-pcm-demux: CMD = stream_remux "mpeg" "$(TARGET_SAMPLES)/mpegps/pcm_aud.mpg" "mpeg" "" "-map 0:a:0" "-codec copy"
+fate-mpegps-remuxed-pcm-demux: CMD = stream_remux "mpeg" "$(TARGET_SAMPLES)/mpegps/pcm_aud.mpg" "" "mpeg" "-map 0:a:0" "-codec copy"
 
 FATE_SAMPLES_FFMPEG += $(FATE_MPEGPS-yes)
 fate-mpegps: $(FATE_MPEGPS-yes)