align with the behavior of other variables

bot/main.py

@@ -49,6 +49,7 @@ def main():
         'frequency_penalty': float(os.environ.get('FREQUENCY_PENALTY', 0.0)),
         'bot_language': os.environ.get('BOT_LANGUAGE', 'en'),
         'show_plugins_used': os.environ.get('SHOW_PLUGINS_USED', 'false').lower() == 'true',
+        'whisper_prompt': os.environ.get('WHISPER_PROMPT', ''),
     }
 
     if openai_config['enable_functions'] and not functions_available:

bot/openai_helper.py

@@ -341,7 +341,7 @@ class OpenAIHelper:
         """
         try:
             with open(filename, "rb") as audio:
-                prompt_text = os.environ.get('WHISPER_PROMPT', '')
+                prompt_text = self.config['whisper_prompt']
                 result = await openai.Audio.atranscribe("whisper-1", audio, prompt=prompt_text)
                 return result.text
         except Exception as e: