Removed the unused use_async_when_possible config variable

OpenSim/Region/Application/OpenSim.cs

@@ -897,7 +897,7 @@ namespace OpenSim
                                 {
                                     connections.AppendFormat("{0}: {1} ({2}) from {3} on circuit {4}\n",
                                         scene.RegionInfo.RegionName, client.Name, client.AgentId, client.RemoteEndPoint, client.CircuitCode);
-                                }, false
+                                }
                             );
                         }
                     );