Refactor imports in sample_agents_computer_use.py (#43002)

Author: glharper

sdk/ai/azure-ai-agents/samples/agents_tools/sample_agents_computer_use.py

@@ -35,9 +35,10 @@
 
 import os, time, base64
 from typing import List
-from azure.ai.agents.models._models import ComputerScreenshot, TypeAction
 from azure.ai.projects import AIProjectClient
 from azure.ai.agents.models import (
+    ComputerScreenshot,
+    TypeAction,
     MessageRole,
     RunStepToolCallDetails,
     RunStepComputerUseToolCall,