fix: make speaker diarization ("Detect Multiple Speakers") un-checked by default

Author: mamoonraja

views/demo.jsx

@@ -26,7 +26,7 @@ export class Demo extends Component {
       rawMessages: [],
       formattedMessages: [],
       audioSource: null,
-      speakerLabels: true,
+      speakerLabels: false,
       keywords: this.getKeywords('en-US_BroadbandModel'),
       // transcript model and keywords are the state that they were when the button was clicked.
       // Changing them during a transcription would cause a mismatch between the setting sent to the