fixup! gre/tun: init ip6gre

gre/files/tun.j2

@@ -2,11 +2,11 @@
 {%- if interface.mode == 'gretun' or interface.mode == 'gretun6' -%}
 auto {{ name }}
 iface {{ name }} inet tunnel
-{%- if interface.mode == 'gretun' -%}
+{% if interface.mode == 'gretun' %}
 	mode	gre
-{%- elif interface.mode == 'gretun6' -%}
+{% elif interface.mode == 'gretun6' %}
 	mode	ip6gre
-{%- endif -%}
+{% endif %}
 	endpoint	{{ interface.remote }}
 	local	{{ interface.local }}
 	{% if 'ttl' in interface %}ttl	{{ interface.ttl }} {% endif %}