Fix imports

Author: AnatoliB

samples-v2/openai_agents/function_app.py

@@ -1,13 +1,10 @@
 import azure.functions as func
-
-from agents import (
-    ModelResponse,
-)
-
+from agents import ModelResponse
 from agents.run import set_default_agent_runner
 from durable_openai_runner import DurableOpenAIRunner
 from yield_exception import YieldException
 from activity_call_tracker import ActivityCallTracker
+from model_invoker import ModelInvoker, ActivityModelInput
 
 app = func.FunctionApp(http_auth_level=func.AuthLevel.FUNCTION)
 
@@ -39,9 +36,6 @@ def basic_hello_world_orchestrator(context):
 
 @app.activity_trigger(input_name="input")
 async def invoke_model_activity(input: str):
-    from model_invoker import ModelInvoker, ActivityModelInput
-    
-    # Deserialize input string into ActivityModelInput object
     activity_input = ActivityModelInput.from_json(input)
 
     model_invoker = ModelInvoker()