unotest: remove import from the same package

Change-Id: I00b0f5624f5b03d53ff01660ca96dc355238b10c
Reviewed-on: https://gerrit.libreoffice.org/11685
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>