geom: remove reconstructed position data from PCCPointSet3
Geometry quantisation introduced an extra field to the point cloud to hold scaled positions (to be restored after geometry coding is complete). This had a side effect of causing significant memory increases since it applied to every instance of the point cloud. Since it is not necessary to store both quantised and scaled positions separately, this commit removes the extra storage and uses a method similar to the decoder to represent partially quantised positions.
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