bug#1305: All code that currently beeps should use visual bell instead

[Gregory Heytings]

> Doom:
>
>  (setq ring-bell-function #'doom-themes-visual-bell-fn
>        visible-bell t)

That's not what I see at 
https://github.com/hlissner/doom-emacs/blob/develop/core/core-ui.el :

(setq uniquify-buffer-name-style 'forward
      ;; no beeping or blinking please
      ring-bell-function #'ignore
      visible-bell nil)