Cyborg theme tweaks

[whjms]

Fix replies label:

.topic [component="post/parent"] {
     background-color: #333;
}

Fix notification color:

body.skin-cyborg .header .notification-list li.unread {
    background-color: #565656;
}

[BenLubar]

Pull requests accepted:

https://github.com/boomzillawtf/tdwtf/blob/14fb2cca981d7b1b364e7fe56973ac5d80f725f7/plugins/nodebb-plugin-tdwtf-customizations/custom.less#L585