Semplifica la gestione degli eventi del joystick rimuovendo l'apertura e la chiusura del joystick

engine/sdl2.py

@@ -116,10 +116,8 @@ class GameWindow:
                 elif event.type == sdl2.SDL_MOUSEMOTION:
                     self.scroll_view((event.motion.x//self.cell_size, event.motion.y//self.cell_size))
                 elif event.type == sdl2.SDL_JOYBUTTONDOWN:
-                    joystick = sdl2.SDL_JoystickOpen(event.jbutton.which)
-                    key = sdl2.SDL_JoystickGetButton(joystick, event.jbutton.button)
+                    key = event.jbutton.button
                     self.key_callback(key)
-                    sdl2.SDL_JoystickClose(joystick)
                     
             # Disegna qui gli sprite
             self.renderer.present()