cpputools: Use appropriate OUString functions on string constants
cpputools: Use appropriate OUString functions on string constants

Change-Id: Iea0f7b4ee3ef867a061c159d90efb5d210ae92a4

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