Make the share location switch pause the location listener instead of only just stopping to send data to backend

[airherna]

Right now we always have the background listener for the location of the user on.

The only difference that the location switch makes it's that it stops sharing the location updates with the BackEnd, but the listener is still active.

We should think about pausing the listener instead, because it would be a better user experience (the android location icon would disappear) and would save battery.