Update caption processing state: next_index=0

processing_state_cursors.json

@@ -75,6 +75,6 @@
     "BlenderLaunchPad_DownloadPirate.com.part2_01_what_is_rendering_frames.zip": "failed",
     "BlenderLaunchPad_DownloadPirate.com.part2_02_converting_image_sequence_to_video_frames.zip": "failed",
     "BlenderLaunchPad_DownloadPirate.com.part2_02_rendering_still_images_frames.zip": "failed",
-    "BlenderLaunchPad_DownloadPirate.com.part2_03_conclusion_frames.zip": "processing"
+    "BlenderLaunchPad_DownloadPirate.com.part2_03_conclusion_frames.zip": "failed"
   }
 }