convert include/sfx2/styfitem.hxx from String to OUString
convert include/sfx2/styfitem.hxx from String to OUString

Change-Id: I442336580573a8a5dbdba4d49ebc2e4e2b64f41a

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