fix backend_template for nginx

bin/v-list-user-packages

@@ -27,7 +27,7 @@ json_list() {
         source $VESTA/data/packages/$package
         echo -n '    "'$PACKAGE'": {
         "WEB_TEMPLATE": "'$WEB_TEMPLATE'",
-		"BACKEND_TEMPLATE": "'$BACKEND_TEMPLATE'",
+        "BACKEND_TEMPLATE": "'$BACKEND_TEMPLATE'",
         "PROXY_TEMPLATE": "'$PROXY_TEMPLATE'",
         "DNS_TEMPLATE": "'$DNS_TEMPLATE'",
         "WEB_DOMAINS": "'$WEB_DOMAINS'",