Update api_usage.py

api_usage.py

@@ -63,7 +63,7 @@ def get_subscription(key):
 def check_key_type(model, rpm):
     if model == "gpt-3.5-turbo":
         if rpm > rate_limit_per_model['gpt-3.5-turbo-old']:
-              return "yes | pay, possibly big key"
+            return "yes | pay, possibly big key"
         elif rpm == rate_limit_per_model['gpt-3.5-turbo-new'] or rpm == rate_limit_per_model['gpt-3.5-turbo-old']:
             return "yes | pay"
         else: