call the correct GetNotePosition method #fdo80551

unit test is ok on Sheet but fails on Col

Change-Id: I28084118e088838b47b77537b981ebe7422ab722
Reviewed-on: https://gerrit.libreoffice.org/9934
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>