Change emoji for closed models

src/display/utils.py

@@ -72,7 +72,7 @@ class ModelType(Enum):
     FT = ModelDetails(name="fine-tuned", symbol="🔶")
     IFT = ModelDetails(name="instruction-tuned", symbol="⭕")
     RL = ModelDetails(name="RL-tuned", symbol="🟦")
-    Unknown = ModelDetails(name="", symbol="?")
+    Unknown = ModelDetails(name="", symbol="🔒")
 
     def to_str(self, separator=" "):
         return f"{self.value.symbol}{separator}{self.value.name}"