Merge pull request NginxProxyManager#1384 from bergi9/patch-1

Add SSL and HTTP2 into IPv6 on listen.conf

Author: jc21

backend/templates/_listen.conf

@@ -7,7 +7,7 @@
 {% if certificate -%}
   listen 443 ssl{% if http2_support %} http2{% endif %};
 {% if ipv6 -%}
-  listen [::]:443;
+  listen [::]:443 ssl{% if http2_support %} http2{% endif %};
 {% else -%}
   #listen [::]:443;
 {% endif %}