Mario animation helper bone errors

[Metro-Shroomin]

Some animations have issues with vertices being scrunched around the waist bone

[ScanMountGoat]

If I recall, this has something to do with the rotation sign flipping when evaluating helper bone constraints. I also don't apply all the rotation values. This will require additional test cases in the ssbh_wgpu repository if someone wants to look into this. It shouldn't have any impact on how the animation renders in game when saving from SSBH Editor.

Relevant rendering code:
https://github.com/ScanMountGoat/ssbh_wgpu/blob/a1ab04d4e2ba15e4da1af56b70fb8479ff4a2016/ssbh_wgpu/src/animation/constraints.rs#L59