power-icon: poke screensaver when resuming
power-icon: poke screensaver when resuming

This will de-activate screensaver on resume if locking is not on and
show the dialog if it is on

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