Animation of Skinned Mesh Object loops with a1 second pause

[yaustar]

@d4r

Could not figure it out. When you look at the animation .glb File in the playcanvas viewer it also looks like all is ok.

It still has the one second gap at the end for me using the GLB generated from FBX by PlayCanvas (Monkey model)

I was also asking @slimbuck about our importer as he does quite a bit of work on it