Use better coordinates for unit test of fdo#77229

Change-Id: I5fae217687e12313451da5bf4b4e6f914551b628
Reviewed-on: https://gerrit.libreoffice.org/10447
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>