[vtkusers] return value of vtkRenderer::UpdateGeometry

[xabi riobe]

Hi,
after rendering a 2D actor, the returned value NumberOfPropsRendered is 2
instead of 1, which i would expect.
This is because both RenderOpaqueGeometry and RenderOverlay increments
NumberOfPropsRendered, but only RenderOverlay actually did some work.
Shouldn't RenderOpaqueGeometry return 0 by default instead of 1?
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