Fbx Importer: Make sure the blendshape curve keys have the correct tangent scale

The tangent of the blendshape curve seam to have the wrong scale (but correct direction) from this UDN.

https://udn.unrealengine.com/s/question/0D54z000079J03OCAS/skip-compressing-anims-and-building-skelmesh-lod-on-import-other-anim-workflow-questions?fromCase=1

We have to investigate if 4.27 have the same issue and fix it if its the case

Create some blendshape in maya and animate the weights with a curve.

Import that curve into Unreal

Look if the tangent have the same direction and scale.