fix ODF validation error
fix ODF validation error

that attribute was only written for backwards compatibility

Change-Id: Icf06300809c55c3a20a74ee3b9d36644d6f5c2d9

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