Update main/app/app.py

main/app/app.py

@@ -230,7 +230,7 @@ js_code = """
 
         input_audio_device = devices["inputs"][input_audio_device];
         output_audio_device = devices["outputs"][output_audio_device];
-        if (use_monitor_device && devices["outputs"][monitor_output_device]) monitor_output_device = devices["outputs"][monitor_output_device];
+        if (monitor && devices["outputs"][monitor_output_device]) monitor_output_device = devices["outputs"][monitor_output_device];
 
         try {
             if (!input_audio_device || !output_audio_device) {