fix wireguard backbone down script

roles/install_wireguard_backbone/templates/down.sh.j2

@@ -1,5 +1,7 @@
 #!/bin/bash
 ip -4 rule del iif bb{{ hostvars[item]['wireguard_bb_name'] }} table ffmyk
 ip -6 rule del iif bb{{ hostvars[item]['wireguard_bb_name'] }} table ffmyk
+ip -4 rule del from all iif bb{{ hostvars[item]['wireguard_bb_name'] }} type unreachable
+ip -6 rule del from all iif bb{{ hostvars[item]['wireguard_bb_name'] }} type unreachable
 ip link set down dev bb{{ hostvars[item]['wireguard_bb_name'] }}
 ip link del bb{{ hostvars[item]['wireguard_bb_name'] }}

roles/install_wireguard_backbone/templates/down2.sh.j2

@@ -1,5 +1,7 @@
 #!/bin/bash
 ip -4 rule del iif bb{{ item.name }} table ffmyk
 ip -6 rule del iif bb{{ item.name }} table ffmyk
+ip -4 rule del from all iif bb{{ item.name }} type unreachable
+ip -6 rule del from all iif bb{{ item.name }} type unreachable
 ip link set down dev bb{{ item.name }}
 ip link del bb{{ item.name }}