gnome-shell freeze exception

[drago01 <drago01 gmail com>]

Hi,

The patch from bug https://bugzilla.gnome.org/show_bug.cgi?id=696212
fixes an exception
on the lock screen during initial setup which is caused by the battery
icon not being initialized /
displayed during the initial setup mode.

The patch adds the icon and thus fixes the exception. Adding the icon
means just adding the
string "battery" to an array (see patch) so should be safe.