and drop the pass-by-reference param from GetSelected, nothing
uses it

Change-Id: I6d616a2b147912af9305410625af6e7afae34e59
Reviewed-on: https://gerrit.libreoffice.org/16312Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>