Spline don't deform landscapes in certain setups

The splines do not deform the landscape when the path is made with a straight spline. When you move a spline point to bend the road it will deform the landscape, but the deformation accuracy seems to depend on how the path is bent.

This was reported and tested in 4.23.1 (CL-9631420). This was reproduced in 4.24.1 (CL-10757647) and Main 4.25 (CL-10870012)

1. Download and open the attached project
2. Click on the Spline underneath "Start Here"
3. In the Details panel for the spline click "Perform Landscape Adjustment" under Landscape
4. Repeat this for the other splines on the map

Results: When a spline is straight, without moving any tangents, the spline doesn't deform the landscape

Expected: The spline should deform the landscape in any situation

Fix UE-51650

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