[Optimization] Optimize pyttsx3 usage by removing unnecessary engine.stop() call

### **Description**

In the Text-to-Speech (TTS) functionality using the `pyttsx3` library, there is an unnecessary call to `engine.stop()` right after `engine.runAndWait()`. Since `engine.runAndWait()` already waits for the speech to finish, `calling engine.stop()` is redundant. This may lead to unnecessary resource usage or potential issues when performing continuous speech synthesis.