Fix zoom to extent on 4.x branch - regional planning

[caseycesari]

Encountered this while working on CoastalResilienceNetwork/regional-planning#78. This effects the regional planning plugin, but I believe the fix needs to be made in the framework.

The method we are using to set the extent of the map object has been moved to the mapView, which isn't available in the MapWrapper class. We'll need to make it available there or find another way to access the mapView instead of the map.