record bandwidth usage on release (#6545)

Robust.Shared/Network/NetManager.cs

@@ -1000,8 +1000,6 @@ namespace Robust.Shared.Network
             var instance = (NetMessage) Activator.CreateInstance(type)!;
             instance.MsgChannel = channel;
 
-#if DEBUG
-
             if (!_bandwidthUsage.TryGetValue(type, out var bandwidth))
             {
                 bandwidth = 0;
@@ -1009,8 +1007,6 @@ namespace Robust.Shared.Network
 
             _bandwidthUsage[type] = bandwidth + msg.LengthBytes;
 
-#endif
-
             try
             {
                 instance.ReadFromBuffer(msg, _serializer);