Update adapter configuration in app.py to include 'lightning' alongside 'stage2' for enhanced inference capabilities.

app.py

@@ -137,7 +137,7 @@ def infer(
     print(f"Seed: {seed}, Steps: {num_inference_steps}, Guidance: {true_guidance_scale}, Size: {width}x{height}")
     print("LoRA Weights - Stage2: 1.0")
 
-    pipe.set_adapters(["stage2"], adapter_weights=[1.0])
+    pipe.set_adapters(["lightning", "stage2"], adapter_weights=[1.0, 1.0])
     stage2_images = pipe(
         image=[pil_image] if pil_image is not None else None,
         prompt=STAGE2_PROMPT,