Resolves fdo#87581: Pb to delete words with 2 initials in Autocorr Except

Cherry-picked from a5811c70bb443190a76a52585580659f96a58a04

Change-Id: I49b97c5c1546f0410542cb67540c5507c95bec98
Reviewed-on: https://gerrit.libreoffice.org/13618
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>