Widget selection sound not working

[vnmabus]

Describe the bug
The widget selection sound is not playing when I change the selected widget.

To Reproduce
As an example, use the example code that added the widget selection sound:

import pygame
import pygame_menu


pygame.init()
surface = pygame.display.set_mode((600, 400))

def set_difficulty(value, difficulty):
    pass

def start_the_game():
    print('Press button')

engine = pygame_menu.sound.Sound()
engine.set_sound(pygame_menu.sound.SOUND_TYPE_WIDGET_SELECTION, pygame_menu.sound.SOUND_EXAMPLES[-1])

menu = pygame_menu.Menu('Welcome', 400, 300, theme=pygame_menu.themes.THEME_BLUE)
menu.set_sound(engine, recursive=True)

menu.add.text_input('Name :', default='John Doe')
menu.add.selector('Difficulty :', [('Hard', 1), ('Easy', 2)], onchange=set_difficulty)
menu.add.button('Play', start_the_game)
menu.add.button('Quit', pygame_menu.events.EXIT)
menu.center_content()

menu.mainloop(surface)

Expected behavior
When you move between widgets, the sound should be played.

[vnmabus]

It seems that when used the keys instead of a joystick to select the widget, apply_sound is not set to True:

pygame-menu/pygame_menu/menu.py

Line 2457 in 41d3d50

if self._current._down():

[ppizarror]

Hi @vnmabus. Fixed in #402