Update app.py

app.py

@@ -157,7 +157,7 @@ def upload_page():
                         Image.fromarray(mask).save(mask_filepath)
 
                 # Merge predicted patches
-                merged_mask_filename = f"generated_masks/mask_{timestamp}.png"
+                merged_mask_filename = f"data/generated_masks/mask_{timestamp}.png"
                 merge(pred_patches, merged_mask_filename, img_array.shape)
 
                 # Save merged mask