export smooth property correctly to OOXML, fdo#74619
export smooth property correctly to OOXML, fdo#74619

MSO 2007 and later have different behavior for the default value.
Be explicit and always export the element.

Change-Id: Ic8cad67db8c882d3642a6662bf710be2088335b7

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core