volume-tile: Use string "Computer" instead of "Netbook"
volume-tile: Use string "Computer" instead of "Netbook"

Fixes: http://bugs.meego.com/show_bug.cgi?id=1833

meego-netbook-ux/meego-panel-devices,meego-netbook-ux/meego-panel-devices,meego-netbook-ux/meego-panel-devices