Examples: Fix context_aggregator.assistant() pipeline position

examples/foundational/20b-persistent-context-openai-realtime.py

@@ -230,8 +230,8 @@ Remember, your responses should be short. Just one or two sentences, usually."""
                 transport.input(),  # Transport user input
                 context_aggregator.user(),
                 llm,  # LLM
-                context_aggregator.assistant(),
                 transport.output(),  # Transport bot output
+                context_aggregator.assistant(),
             ]
         )