fix(point3dsymbol): make elevation relative to chunk origin

[benoitdm-oslandia]

Elevation data are referenced according to 0 but X/Y coordinates are computed according to chunk center. This PR makes the chunk center reference common to all coordinates.

[github-actions]

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(Built from commit 5984d5e)

[benoitdm-oslandia]

@ptitjano gentle ping!

[uclaros]

Isn't mChunkOrigin.z() always zero for vector layers / annotation?

[nyalldawson]

Yeah -- I'd like to see some more instructions on how this manifests as a bug

[github-actions]

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[benoitdm-oslandia]

Hi! sorry for the delay! This is not a bug in the current state of the code but it is an issue for another PR I am working on (rework of #62676). So in the current state of the code, this PR add more consistency in the way we handle chunk origin in point3dsymbol.