Update simple example

examples/simple.py

@@ -2,10 +2,10 @@ import asyncio
 
 from browser_use import Agent, Controller
 
-controller = Controller()
+tools = Controller()
 
 
-@controller.action('Ask human for help with a question')
+@tools.action('Ask human for help with a question')
 def ask_human(question: str) -> str:
 	answer = input(f'{question} > ')
 	return f'The human responded with: {answer}'
@@ -13,7 +13,7 @@ def ask_human(question: str) -> str:
 
 agent = Agent(
 	task='Ask human for help',
-	controller=controller,
+	tools=tools,
 )