Dear Maintainer,

when the pcspkr module is loaded (was the default on my machine), dino
uses it
to beep when I press backspace on an empty input line.

To reproduce:

- execute `modprobe pcspkr` if it is not loaded
- open a chat in dino
- clear the message field
- press backspace
- hear a beep

This behaviour is rather annoying, as it beeps loudly whenever I clear the
message and hit backspace one or more times too often. I cannot control the
volume of this alert or turn it off in dino.

Dino is the only software that uses the beep of my PC speakers as far as
I can
tell. I have various other messagers or the shell which does not show this
behaviour.

Thank you.