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

Change-Id: I6ff256e091770d67f98b1b6b8d447a22fd720d4e

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