Rounding of conversion of anim length into frames add an empty frame to the animation

cf. https://forums.unrealengine.com/t/gltf-import-bug-animations-have-an-entire-extra-frame-when-source-animation-is-slighly-above-target-length/2697309

The GLTF importer adds an extra frame to the animation sequence when the source animation is slightly above the target length. As seen in the image below the source animation length is 40.02 which should be 20 frames long in ue5, but it is rounded up to 21 because of the .02 decimals.

1. Import the attached glTF file
2. Open the animsequence “worserobotRun_ID_5_variation_0_”
3. Notice that there are 21 frames of animation and the last frame the robot does not move.