fix typo

charles_actor.py

@@ -169,7 +169,7 @@ class CharlesActor:
                         has_spoken_for_this_prompt = False
                     elif len(prompt) > 0 and prompt not in prompts_to_ignore:
                         # sometimes we get a false signal of speaker_finsihed
-                        # in which case we get new prompts preview before we have spoken
+                        # in which case we get new prompts before we have spoken
                         if len(previous_prompt) > 0 and not has_spoken_for_this_prompt:
                             additional_prompt = previous_prompt
                             has_spoken_for_this_prompt = True