wireguard: T2653: fix IPv6 peer address configuration
wireguard: T2653: fix IPv6 peer address configuration

While migration to get_config_dict() was introduced in commit 789775af9f5 the
logic for adding an IPv4 or IPv6 peer address was using the wrong dictionary
to determine if it's an IPv4 or IPv6 address.

We now use the proper peer dict over the wrong config dict.

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x