bug#55825: [PATCH] Reconvert EPUB buffers when user CSS is changed

[Eli Zaretskii]

> Cc: 55825@debbugs.gnu.org
> From: Kjartan Oli Agustsson <kjartanoli@outlook.com>
> Date: Tue, 07 Jun 2022 21:40:09 +0000
> 
> > In doc-view--epub-reconvert:
> > doc-view.el:238:44: Warning: Unused lexical argument `event'
> 
> Yes, I'm not sure what the best way to get rid of this one is.  If
> `doc-view--epub-reconvert' doesn't take `event' as an argument it will
> cause a warning about being called with to many arguments when used as
> the callback for the file watcher set up in
> `doc-view-custom-set-epub-user-stylesheet'

Use _event instead, it should take care of that.