Update app.py

fixed error ... again :(

app.py

@@ -7,7 +7,7 @@ client = ic("microsoft/phi-4")
 
 def respond(message, history):
 
-    messages = [{"role": "system", "content: "You are a friendly chatbot!"}]
+    messages = [{"role": "system", "content": "You are a friendly chatbot!"}]
 
     if history:
         messages.extend(history)