...to "..."+OUStringToOString(...), in preparation of making OUStringToOString
take a std::u16string_view
Change-Id: Ic01ca249d4d0eb58ac959ffdf96471308a3715dc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107600
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>