that are better declared as OUStringLiteral

Change-Id: Ifb5d9a12bb31a68641940bec16971a8181a46567
Reviewed-on: https://gerrit.libreoffice.org/27377Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>