LandscapeComponent generates incorrect OccluderVertices for software occlusion

OccluderVertices didn't consider the subsection's transition, so the position of the OcclusderVertices are not correct.

I made a fix as follows:

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1. Create a empty project.
2. Create a empty level.
3. Create a Landscape, setting the "Sections pre component" with "2x2 sections".
4. Enable "Support Software Occlusion Culling" in ProjectSettings.
5. Enter "r.so.VisualizeBuffer" in the console command input.