[calibre-web] Change ingress to $http_connection so the login works a…

…gain

resolves alexbelgium#1050

calibre_web/rootfs/etc/nginx/servers/ingress.conf

@@ -12,7 +12,7 @@ server {
        # Base from https://github.com/janeczku/calibre-web/wiki/Setup-Reverse-Proxy#nginx
        proxy_bind              $server_addr;
        proxy_pass              http://127.0.0.1:8083;
-       proxy_set_header        Connection              "Upgrade";
+       proxy_set_header        Connection              $http_connection;
        proxy_set_header        Upgrade                 $http_upgrade;
        proxy_set_header        Host                    $http_host;
        proxy_set_header        X-Forwarded-For         $proxy_add_x_forwarded_for;