Cleaning unused variable.

backend/templates/_location.conf

@@ -7,10 +7,6 @@
     proxy_set_header X-Forwarded-For    $remote_addr;
     proxy_set_header X-Real-IP		$remote_addr;
 
-    set $proxy_forward_scheme {{ forward_scheme }};
-    set $proxy_server         "{{ forward_host }}";
-    set $proxy_port           {{ forward_port }};
-
     proxy_pass       {{ forward_scheme }}://{{ forward_host }}:{{ forward_port }}{{ forward_path }};
 
     {% include "_access.conf" %}