Committer's note: There is no Oval or Ellipse transition in MSO formats,
so fallback to circle on export to those.

Change-Id: Ibc3d617d3bb94bdd0702bb4d60ce5fbe2eea8e24
Reviewed-on: https://gerrit.libreoffice.org/23661Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>
Tested-by: jan iversen <jani@documentfoundation.org>