Pose assets do not snap to the pose when Additive is disabled

This is a regression from 4.13.1 as it was snapping to the pose then.

If this was an intentional change please let us know and we can update the test case to reflect this.

1. Open up QAGame in the editor
2. Open the Test_Pose asset
3. Click and drag the Smile pose weight bar to the right

Result: Pose blends into the smile pose as it is dragged to the right

Expected: The pose snaps to Smile as soon as it becomes greater than 0