Stereo to mono in the accessibility settings

[Nathan Colinet <colinetnathan98@xxxxxxxxx>]

Hello,
I don't hear well from one of my ear so I have the remap stereo to
mono. On Android you can easily do it from the accessibility menu item
in the settings but I can't find it on Plasma. To enable it I had to play
with pulseaudio config file, which is OK for me but maybe some people
would rather prefer to have an easier toggle button in the settings.

I just thought I could share it here.

Have a good day,

Nathan Colinet