Call final_task() on the current context that has been re-started

in the previous fence(), when inside ttg_finalize(), so that
if we're using user-trigger termination detection the parsec_context_wait()
on that context will complete during the call to destroy_worlds().

ttg/ttg/parsec/ttg.h

@@ -663,6 +663,10 @@ namespace ttg_parsec {
     ttg::detail::set_default_world(std::move(world));
   }
   inline void ttg_finalize() {
+    // We need to notify the current taskpool of termination if we are in user termination detection mode
+    // or the parsec_context_wait() in destroy_worlds() will never complete
+    if(0 == ttg::default_execution_context().rank()) 
+      ttg::default_execution_context().impl().final_task();
     ttg::detail::set_default_world(ttg::World{});  // reset the default world
     ttg::detail::destroy_worlds<ttg_parsec::WorldImpl>();
     MPI_Finalize();