Update `delete.j2` in Juniper templates

Error fix: was missing `interface_name` value in template

geant/gap_ansible/roles/iptrunk_migration/templates/juniper/delete.j2

 delete protocols isis interface {{ local_side.iptrunk_side_ae_iface }}.0
 delete interfaces {{ local_side.iptrunk_side_ae_iface }}
 {% for iface in local_side.iptrunk_side_ae_members %}
-delete interfaces {{ iface }}
-delete protocols lldp interface {{ iface }}
+delete interfaces {{ iface.interface_name }}
+delete protocols lldp interface {{ iface.interface_name }}
 {% endfor %}