fix variable name

basic_agent.py

@@ -16,6 +16,6 @@ class BasicAgent:
         )
         
     def __call__(self, question: str) -> str:
-        fixed_answer = self.agent.run(task=question)
-        print(f"Agent returning fixed answer: {fixed_answer}")
-        return fixed_answer
+        final_answer = self.agent.run(task=question)
+        print(f"Agent returning final answer: {final_answer}")
+        return final_answer