fix std::optional usage after rebase

Author: Totto16

src/input/joystick_input.cpp

@@ -690,13 +690,13 @@ input::WiiJoystickInput_Type1::WiiJoystickInput_Type1(
 } { }
 
 
-[[nodiscard]] helper::optional<input::NavigationEvent> input::WiiJoystickInput_Type1::get_navigation_event(
+[[nodiscard]] std::optional<input::NavigationEvent> input::WiiJoystickInput_Type1::get_navigation_event(
         const SDL_Event& event
 ) const {
     if (event.type == SDL_JOYBUTTONDOWN) {
 
         if (event.jbutton.which != instance_id()) {
-            return helper::nullopt;
+            return std::nullopt;
         }
 
         switch (event.jbutton.button) {
@@ -713,7 +713,7 @@ input::WiiJoystickInput_Type1::WiiJoystickInput_Type1(
             case JOYCON_B:
                 return NavigationEvent::BACK;
             default:
-                return helper::nullopt;
+                return std::nullopt;
 
                 //note, that  NavigationEvent::TAB is not supported
         }

src/input/joystick_input.hpp

@@ -205,7 +205,7 @@ namespace input {
 
         WiiJoystickInput_Type1(SDL_Joystick* joystick, SDL_JoystickID instance_id, const std::string& name);
 
-        [[nodiscard]] helper::optional<NavigationEvent> get_navigation_event(const SDL_Event& event) const override;
+        [[nodiscard]] std::optional<NavigationEvent> get_navigation_event(const SDL_Event& event) const override;
 
         [[nodiscard]] std::string describe_navigation_event(NavigationEvent event) const override;