Convert chart 3D scene geometry tabpage to widget

Change-Id: I5840d47047880636fb4e8f80ecef1a6f5377d786
Reviewed-on: https://gerrit.libreoffice.org/6840
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>