fate/mxf: fix mxf-probe-j2k on big endian systems

Jpeg2000 decoder is decoding in native endian, so let's use the same workaround
as in fate-mxf-probe-applehdr10.

Fixes ticket #10868.

Signed-off-by: Marton Balint <cus@passwd.hu>

tests/fate/mxf.mak

@@ -29,7 +29,7 @@ fate-mxf-probe-dnxhd: CMD = run $(PROBE_FORMAT_STREAMS_COMMAND) -i "$(SRC)"
 
 FATE_MXF_PROBE-$(call DEMDEC, MXF, JPEG2000) += fate-mxf-probe-j2k
 fate-mxf-probe-j2k: SRC = $(TARGET_SAMPLES)/imf/countdown/countdown-small.mxf
-fate-mxf-probe-j2k: CMD = run $(PROBE_FORMAT_STREAMS_COMMAND) -i "$(SRC)"
+fate-mxf-probe-j2k: CMD = run $(PROBE_FORMAT_STREAMS_COMMAND) -i "$(SRC)" | sed -e "s/rgb48../rgb48/"
 
 FATE_MXF_PROBE-$(call DEMDEC, MXF, DVVIDEO PCM_S16LE) += fate-mxf-probe-dv25
 fate-mxf-probe-dv25: SRC = $(TARGET_SAMPLES)/mxf/Avid-00005.mxf

tests/ref/fate/mxf-probe-j2k

@@ -14,7 +14,7 @@ film_grain=0
 has_b_frames=0
 sample_aspect_ratio=1:1
 display_aspect_ratio=16:9
-pix_fmt=rgb48le
+pix_fmt=rgb48
 level=-99
 color_range=unknown
 color_space=unknown