fix self reported json format

static/eval_results/Default/self_reported.json

@@ -4,5 +4,5 @@
     "Qwen2.5-VL-7B": 36.8,
     "Qwen2.5-VL-3B": 28.9,
     "GPT-o1": 60.4,
-    "GPT-o1-mini": 54.2,
-}
+    "GPT-o1-mini": 54.2
+}