fix: optimization: PVS-Studio warning V832

It's better to use '= default;' syntax instead of empty constructor and destructor body.
Using '= default;' can help the compiler generate more optimal code.

Reported by: PVS-Studio

Signed-off-by: Vyacheslav Ivanov <islavaivanov76@gmail.com>

src/graphics/ui/GUI.cpp

@@ -44,8 +44,7 @@ GUI::GUI() {
     container->add(tooltip);
 }
 
-GUI::~GUI() {
-}
+GUI::~GUI() = default;
 
 std::shared_ptr<Menu> GUI::getMenu() {
     return menu;