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

UE - Editor - Content Pipeline - Asset Migration - Oct 4, 2021

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-buildin ...