fdo#69025 remove country option from Letter Wizard

Change-Id: Idba96d20b146c6e6ab05157cb4afdc6f1c7eeffd
Reviewed-on: https://gerrit.libreoffice.org/6731
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>