processors(realtime-ai): add assistant before output transport

Cartesia can do word-to-word output instead of full sentences. This means that
for properly adding things into the context we need to add it before the
transport, otherwise some words might be lost.

src/pipecat/processors/frameworks/realtimeai.py

@@ -166,8 +166,8 @@ class RealtimeAIProcessor(FrameProcessor):
                 self._tma_in,
                 self._llm,
                 self._tts,
+                self._tma_out,
                 self._transport.output(),
-                self._tma_out
             ])
             self._pipeline = pipeline