Fix lingering bbox marker problem.
Fix lingering bbox marker problem.

The selected unit stayed on the map when closing its details,
if it was originally a bbox unit and the map had been zoomed out
after its selection and before deselecting it.

City-of-Helsinki/servicemap,City-of-Helsinki/servicemap,City-of-Helsinki/servicemap,Zeukkari/servicemap,vaaralav/servicemap,Zeukkari/servicemap,vaaralav/servicemap,vaaralav/servicemap