Update unidiffuser/sample_v1.py

Fix sample function for gradio app

unidiffuser/sample_v1.py

@@ -433,5 +433,6 @@ def sample(mode, prompt, image, sample_steps=50, scale=7.0, seed=None):
     if seed is not None:
         config.seed = seed
     
-    evaluate(config)
+    sample_images, sample_text = evaluate(config)
+    return sample_images, sample_text