Recurrence: Broke out handleUntil as a separate function

- This means until porocesing is no longer controlled by rc.recurrence, which
  was never intended.

src/commands/CmdHistory.cpp

@@ -335,6 +335,7 @@ int CmdHistoryBase<HistoryStrategy>::execute (std::string& output)
   completedGroup.clear ();
 
   // Apply filter.
+  handleUntil ();
   handleRecurrence ();
   Filter filter;
   std::vector <Task> filtered;