Update reasoning_agent.py

Author: Fr4nc3

src/backend/v3/magentic_agents/reasoning_agent.py

@@ -37,12 +37,6 @@ def __init__(self, agent_name: str,
     async def _after_open(self) -> None:
         self.kernel = Kernel()
 
-        # Token provider for SK chat completion
-        sync_cred = SyncDefaultAzureCredential()
-
-        def ad_token_provider() -> str:
-            token = sync_cred.get_token("https://cognitiveservices.azure.com/.default")
-            return token.token
 
         chat = AzureChatCompletion(
             deployment_name=self._model_deployment_name,