Update app.py

app.py

@@ -171,7 +171,7 @@ def do_inference(input_3d, sample_seed=0, do_sampling=False, do_marching_cubes=F
     artist_mesh.remove_unreferenced_vertices()
     artist_mesh.fix_normals()
 
-     if do_smooth_shading:
+    if do_smooth_shading:
         smooth_shade(artist_mesh)
 
     if artist_mesh.visual.vertex_colors is not None: