fate/image: Enable fate-webp-rgb-lossless-palette-predictor test

Postponed in 9f4708c22d
because the sample had not been uploaded at that time.

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

tests/fate/image.mak

@@ -557,9 +557,8 @@ fate-webp-rgb-lena-lossless-rgb24: CMD = framecrc -i $(TARGET_SAMPLES)/webp/rgb_
 FATE_WEBP += fate-webp-rgba-lossless
 fate-webp-rgba-lossless: CMD = framecrc -i $(TARGET_SAMPLES)/webp/rgba_lossless.webp
 
-# TODO(https://trac.ffmpeg.org/ticket/9368): enable after sample is uploaded
-# FATE_WEBP += fate-webp-rgb-lossless-palette-predictor
-# fate-webp-rgb-lossless-palette-predictor: CMD = framecrc -i $(TARGET_SAMPLES)/webp/dual_transform.webp
+FATE_WEBP += fate-webp-rgb-lossless-palette-predictor
+fate-webp-rgb-lossless-palette-predictor: CMD = framecrc -i $(TARGET_SAMPLES)/webp/dual_transform.webp
 
 FATE_WEBP += fate-webp-rgb-lossy-q80
 fate-webp-rgb-lossy-q80: CMD = framecrc -i $(TARGET_SAMPLES)/webp/rgb_q80.webp