Update app.py

app.py

@@ -30,8 +30,9 @@ def get_lcm(prompt):
 def get_sdxl_lightning(prompt):
     client = Client("AP123/SDXL-Lightning")
     result = client.predict(
-    		prompt,	# str  in 'parameter_1' Textbox component
-    		api_name="/predict"
+        prompt,	# str  in 'parameter_1' Textbox component
+        "4-Step",
+        api_name="/predict"
     )
     print(result)
     return result