[nextcloud-web] Re-use a named capture group

[Andrea Veri <averi src gnome org>]

commit f6810a1035ed2b02dc329313e73fc3fa447228b2
Author: Andrea Veri <averi redhat com>
Date:   Tue Jun 22 16:59:15 2021 +0200

    Re-use a named capture group

 nginx/nginx.conf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 7bb7e3e..0121129 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -29,7 +29,7 @@ http {
 
   map $http_x_forwarded_for $custom_x_forwarded_for {
     default $http_x_forwarded_for;
-    ~^::ffff:.* $1;
+    "~^::ffff:(?<ip>.*)$" $ip;
   }
 
   server {