babel mullvad_uplink fix

roles/install_babeld/templates/babeld.conf.j2

@@ -9,6 +9,9 @@ ipv6-subtrees true
 {% for peer in groups['ffrl_uplink'] %}
 interface bb{{ hostvars[peer]['wireguard_bb_name'] }}
 {% endfor %}
+{% for peer in groups['mullvad_uplink'] %}
+interface bb{{ hostvars[peer]['wireguard_bb_name'] }}
+{% endfor %}
 {% endif %}
 {% if 'mullvad_uplink' in group_names %}
 {% for peer in groups['fastd'] %}