feat: remove constraints from clones

[anatawa12]

Since Open Beta 1381, constraints are removed from mirrored avatars so I implemented this behavior.

[jellejurre]

I believe they re-added this, didn't they?

[anatawa12]

Yes. VRChat rollbacked removing constraints for now. they says it will be added in the feature so I make this pull request draft for now and when they released again, I make ready for review again