fdo#80363 add _wfullpath to expand ".." in dictionary paths

Change-Id: I6c9edd0b4d2c63f7735d090e5d2d72d5fb81b921
Reviewed-on: https://gerrit.libreoffice.org/10400
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>