No need to convert from an OUString to a sal_Unicode[] and then back
again.
There is only one ScRawToken allocated so no need to be ultra careful
with extra fields here.

Change-Id: I279835e83ba02d9d4cf4d724bd8046be6aca1405
Reviewed-on: https://gerrit.libreoffice.org/58580
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>