SwUndoPageDesc: take care of SwPageDesc::aFirst
SwUndoPageDesc: take care of SwPageDesc::aFirst

Change-Id: I05621cc1bf6d4201120c8757d5c2886723d7d18c

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