[nextcloud-web] Correct variable is $http_x_forwarded_for

[Andrea Veri <averi src gnome org>]

commit 941ed4dceee7fb9fbabd77f67eb4b27f2925133d
Author: Andrea Veri <averi redhat com>
Date:   Tue Jun 22 16:42:40 2021 +0200

    Correct variable is $http_x_forwarded_for

 nginx/nginx.conf | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 749c63e..edf82b1 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -27,8 +27,8 @@ http {
     server localhost:9000;
   }
 
-  map $proxy_add_x_forwarded_for $custom_x_forwarded_for {
-    default $proxy_add_x_forwarded_for;
+  map $$http_x_forwarded_for $custom_x_forwarded_for {
+    default $http_x_forwarded_for;
     ~^::ffff:(?<ip>.*) '$ip';
   }