Fix for the following regression:

Suggestions for all 1- or 2-letter words contain ~all Greek
letters from the commit c4318b8c
(add Greek alphabet to the technical dictionary).

Change-Id: I9356d439debfec34a963edbe5daacde976cc532c
Reviewed-on: https://gerrit.libreoffice.org/22449Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>