Update nginx.conf.template to use UPSTREAM_SERVER

Removed hardcoded proxy_pass to 'owlery' in two locations.

Author: Robbie1977

nginx.conf.template

@@ -46,7 +46,6 @@ http {
             set $backend "${UPSTREAM_SERVER}";
             proxy_pass http://$backend$request_uri;
             proxy_ignore_client_abort on;
-            proxy_pass http://owlery$request_uri;
             proxy_http_version 1.1;
             proxy_set_header Connection "";
             proxy_connect_timeout 1h;
@@ -79,7 +78,6 @@ http {
             set $backend "${UPSTREAM_SERVER}";
             proxy_pass http://$backend$request_uri;
             proxy_ignore_client_abort on;
-            proxy_pass http://owlery$request_uri;
             proxy_http_version 1.1;
             proxy_set_header Connection "";
             proxy_connect_timeout 1h;