qadevOOo: use a character literal

Change-Id: I6d3e592de64c63e66bb788b112e188ef217e7bf7
Reviewed-on: https://gerrit.libreoffice.org/11367
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>