Bug 1049685 - [Tarako][Settings] Ringer's name overlay Alerts in Sound setting page

* Bring text-overflow: ellipsis back and still keep box-shadow hack
Merge pull request #22652 from begeeben/1049685_ringers_name_overlay

Bug 1049685 - [Tarako][Settings] Ringer's name overlay Alerts in Sound setting page, r=arthur.chen