add option to restore hbmenu when disabling "Replace hbmenu on exit".

fixes #66

sphaira/include/ui/option_box.hpp

@@ -42,6 +42,8 @@ public:
     auto Update(Controller* controller, TouchInfo* touch) -> void override;
     auto OnLayoutChange() -> void override;
     auto Draw(NVGcontext* vg, Theme* theme) -> void override;
+    auto OnFocusGained() noexcept -> void override;
+    auto OnFocusLost() noexcept -> void override;
 
 private:
     auto Setup(std::size_t index) -> void; // common setup values