fdo#83848 Add GetAddressConvention to RefButton

Reviewed-on: https://gerrit.libreoffice.org/11578
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>
(cherry picked from commit 2c7595a911c3b0102162c2ad9cef4a84538b66f8)

Change-Id: I20d633909d3c13bf49998a6cca054ab125b6c991