Update transcription processing state: next_index=0, count=0

processing_state_transcriptions.json

@@ -13,7 +13,7 @@
     "audio/0001_Introduction.wav": "failed",
     "audio/0002_Why_use_motion_design.wav": "failed",
     "audio/0003_Types_of_animations_and_examples.wav": "failed",
-    "audio/0004_Intro.wav": "processing"
+    "audio/0004_Intro.wav": "failed"
   },
   "transcription_count": 0
 }