takes the last token in case of chained "." instead of the first one

to avoid

aa.b.
autocorrects (wrongly) to
aaaa.

Change-Id: Ibca68850282a0d3aec67ca518bdcbf1da676e155
Reviewed-on: https://gerrit.libreoffice.org/17858Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>