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/plNetCliAgeJoiner.cpp

@@ -338,6 +338,7 @@ void plNCAgeJoiner::ExecNextOp () {
             ((plResManager*)hsgResMgr::ResMgr())->SetProgressBarProc(nil);
             delete progressBar;
             progressBar = nil;
+            nc->EndTask();
 
             nextOp = kEnableClickables;
         }