[Legacy][FBX] Animation curves are not added to the skeleton anymore

Issue in Legacy.

Import in 5.2 the attached FBX. Deactivate "Do not import curves with 0 values"

In that case both Animation sequence and skeleton show the 5 curves. 

User wants the curve on skeleton to be able to access them through control rig

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Import in 5.4 or 5.5 the attached FBX. With Legacy or Interchange and deactivate the "Do not import curves with 0 values".

the skeleton only shows 2 out of the 5 animation curves.

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cf. discussion from mrpdean for details

https://forums.unrealengine.com/t/5-5-not-able-to-import-animation-curves-since-5-3-5-5/2267442

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