Fix filename for default prompt in analyze_with_persona function

app.py

@@ -58,7 +58,7 @@ def analyze_with_persona(statement, persona=""):
     try:
 
         # read default prompt
-        with open("default_prompt.txt", "r") as f:
+        with open("default-prompt.txt", "r") as f:
             default_prompt = f.read().strip()