[aur-general] please orphan mutt-sidebar

[Giorgio Lando]

The mutt-sidebar package is not updated anymore and the contributor does
not answer to email messages. This has lead to the mistaken creation of
an analogue mutt-with-sidebar package.
I guess that a TU could orphan mutt-sidebar, so it can be updated and
mutt-with-sidebar can be removed.
Thanks
Giorgio Lando - patroclo7