fix: prompt template issue (#3449)

api/core/workflow/nodes/question_classifier/template_prompts.py

@@ -18,7 +18,7 @@ QUESTION_CLASSIFIER_SYSTEM_PROMPT = """
 
 QUESTION_CLASSIFIER_USER_PROMPT_1 = """
     { "input_text": ["I recently had a great experience with your company. The service was prompt and the staff was very friendly."],
-    "categories": ["Customer Service, Satisfaction, Sales, Product"],
+    "categories": ["Customer Service", "Satisfaction", "Sales", "Product"],
     "classification_instructions": ["classify the text based on the feedback provided by customer"]}```JSON
 """
 
@@ -29,7 +29,7 @@ QUESTION_CLASSIFIER_ASSISTANT_PROMPT_1 = """
 
 QUESTION_CLASSIFIER_USER_PROMPT_2 = """
     {"input_text": ["bad service, slow to bring the food"],
-    "categories": ["Food Quality, Experience, Price" ], 
+    "categories": ["Food Quality", "Experience", "Price" ], 
     "classification_instructions": []}```JSON
 """