Bugfix: Mesh quality degradation in v1.1 due to incorrect zero tensor inclusion in scatter_reduce_

[jinhwanlazy]

I noticed that the mesh quality is slightly worse in v1.1 compared to v1.0. After investigating to find the source of this difference, I discovered something in this file:
https://github.com/nv-tlabs/NKSR/blob/91b7e53f9f510b279070753d4c0ca952cd7b22c5/package/nksr/scatter.py#L51C1-L52C63

The function scatter_reduce_ has an optional argument include_self=True. In this case, it makes the max computation include a zero tensor that was just created by create_scatter_output. I don't think this was intended.

I've made a fix here: jinhwanlazy@bf3c6eb#diff-3b9859e163f3217bc4b5d39dfede4b345d32ad1720a66fc2a077a070680c1bc5R48

I wanted to create a PR for this, but I couldn't because v1.1 isn't on any branch. So I'm leaving this issue here instead.