Ensure there is always book-spinning while linking

This should help people realize that things are happening... Even if
whatever server they're connected to takes a very long time to process a
join request. At some point in the future, the linking process should be
de-serialized.

Sources/Plasma/PubUtilLib/plNetClient/plNetCliAgeLeaver.cpp

@@ -216,6 +216,7 @@ void plNCAgeLeaver::ExecNextOp () {
 
         //====================================================================
         case kUnloadAge: {
+            nc->BeginTask();
             NetCliGameDisconnect();
 
             // Cull nodes that were part of this age vault (but not shared by the player's vault)