Align annotator terminology to expert/non_expert

annotations/release_summary.json

@@ -4,12 +4,12 @@
   "num_systems": 24,
   "num_ratings": 25200,
   "unique_raters_by_type": {
-    "common": 9,
-    "pro": 3
+    "non_expert": 9,
+    "expert": 3
   },
   "rater_rows_by_type": {
-    "common": 12600,
-    "pro": 12600
+    "non_expert": 12600,
+    "expert": 12600
   },
   "total_audio_seconds": 42164.309,
   "total_audio_hours": 11.712