Fix an edge case, where the "Bottom" selection output would only
select one vertex when the Top Radius was set to '0' and the
Fill Type to 'None'.
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When using the cone mesh primitive node to create a cone with a point
at the top and Fill Type 'None' the "Bottom" selection output would
only select one vertex instead of the entire bottom rim.
This patch fixes that by correctly slizing the selection when the
selection is on the `Point` domain rather than the `Face` domain.
||master|patch|
|---|---|---|
|Bug report file|||
|Test file with all cone selections|||
Merge branch 'master'