Wall-facing (vertical) spaceboundaries not properly cropped

The wall-facing vertical space boundary connection geometry is not properly cropped at the intersection with the ceiling. Instead these surfaces reach up to the set limit of the room height. The sample below shows a room from the Revit Basic tutorial model.


For the space itself, the geometry is properly exported - the same should be used for the space boundaries.

Here is an excerpt from an export with one space and its boundaries: [Autodesk-rac-basic-sample-project_spaceboundaries.ifc.txt](https://github.com/Autodesk/revit-ifc/files/2524355/Autodesk-rac-basic-sample-project_spaceboundaries.ifc.txt). Note that not all boundary defining walls include shape representations.

Start with the IFC export path for wall-facing vertical space-boundary connection geometry and compare it with the space geometry described in the issue. Inspect Autodesk-rac-basic-sample-project_spaceboundaries.ifc.txt and the linked image to identify the expected ceiling intersection. Done means the exported boundary surfaces are cropped at the ceiling rather than extending to the room-height limit, including cases where boundary-defining walls lack shape representations.

Written by the indexing model from the issue text.