Bug fix: Memory leak when deleting completed background transfers

(cherry picked from commit b228111058cdb7c8a18cad56b65b777af48b68e1)

Source commit: 24d52456cd38598bfdb76adcecb7c1e43bc13a27

source/core/Queue.cpp

@@ -882,6 +882,7 @@ bool __fastcall TTerminalQueue::ItemDelete(TQueueItem * Item)
         if (Result)
         {
           FDoneItems->Delete(Index);
+          delete Item;
           UpdateList = true;
         }
       }