mwan3: also show tracker state via ubus

mwan3: also show tracker state via ubus

The tracker state is not shown via ubus. Only if the tracker was in
active state, then the boolean running was set or not. By adding the
tracking state to the ubus information we could also evaluate the state
of the tracker. To remain compatible, the runnig flag of the tracker is
not removed, which in fact displays the same information, but only if
the tracker is in state 'active' or not.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>