Remove workaround, this only applies to the IPs set by the middleware

Jellyfin.Server/Extensions/ApiServiceCollectionExtensions.cs

@@ -372,14 +372,6 @@ namespace Jellyfin.Server.Extensions
                 return;
             }
 
-            // In order for dual-mode sockets to be used, IP6 has to be enabled in JF and an interface has to have an IP6 address.
-            if (addr.AddressFamily == AddressFamily.InterNetwork && config.EnableIPV6)
-            {
-                // If the server is using dual-mode sockets, IPv4 addresses are supplied in an IPv6 format.
-                // https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/proxy-load-balancer?view=aspnetcore-5.0 .
-                addr = addr.MapToIPv6();
-            }
-
             if (prefixLength == 32)
             {
                 options.KnownProxies.Add(addr);