Make overriding explicit and remove redundant virtual specifiers on overriding destructors - Core & UnitTests

Source/Core/DolphinQt/NetPlay/NetPlayBrowser.h

@@ -29,7 +29,7 @@ class NetPlayBrowser : public QDialog
   Q_OBJECT
 public:
   explicit NetPlayBrowser(QWidget* parent = nullptr);
-  ~NetPlayBrowser();
+  ~NetPlayBrowser() override;
 
   void accept() override;
 signals:

Source/Core/DolphinQt/NetPlay/NetPlayDialog.h

@@ -40,7 +40,7 @@ public:
 
   explicit NetPlayDialog(const GameListModel& game_list_model,
                          StartGameCallback start_game_callback, QWidget* parent = nullptr);
-  ~NetPlayDialog();
+  ~NetPlayDialog() override;
 
   void show(std::string nickname, bool use_traversal);
   void reject() override;