MapWithAILayer: Initialize data source listeners on initialization

Signed-off-by: Taylor Smock <tsmock@fb.com>

src/main/java/org/openstreetmap/josm/plugins/mapwithai/backend/MapWithAILayer.java

@@ -78,6 +78,7 @@ public class MapWithAILayer extends OsmDataLayer implements ActiveLayerChangeLis
         data.setDownloadPolicy(DownloadPolicy.BLOCKED);
         lock = new MapLock();
         MainApplication.getLayerManager().addActiveLayerChangeListener(this);
+        new ContinuousDownloadAction(this); // Initialize data source listeners
     }
 
     @Override