convert sfx2/inc/srchdlg.hxx from String to OUString
convert sfx2/inc/srchdlg.hxx from String to OUString

Change-Id: I344787557f7e9b46ba2a323ba7d3c30ecfa33f12

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