Fix meshes not centering when created using buffers

[depilz]

Fixes this:

CleanShot.2025-01-16.at.18.01.58.mp4

Result:

CleanShot.2025-01-16.at.18.02.16.mp4

@ggcrunchy does this looks good to you?

[ggcrunchy]

Definitely looks better in your example. 😄

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[Shchvova]

Reason I haven't merged it yet is because of backward compatibility. Do you think it'll break existing apps?

[ggcrunchy]

@Shchvova Yeah, maybe the // center mesh block wants to be in a if (fromVertices) condition. Even if nothing did break, it would avoid redoing the calculation.