Make the battery applet to remain inactive when batteries are in "NoCharge" state

Fix BUG #235236, making the battery inactive when it's not charging. The systray
will make the work to show/hide the applet when necessary and the user can configure
it's behavior through systray's config options.

Bonus points for not adding a new option to the applet's settings ;)

Tested with kdelibs and kdebase-workspace, both master branches.

Patch by: Thiago Jung Bauermann <thiago.bauermann@gmail.com>
Signed-off-by: Artur Duque de Souza <asouza@kde.org>

BUG:235236
FIXED-IN:4.6.3
CCMAIL:thiago.bauermann@gmail.com