remove geoappstate from mapboxlayer

MapBox Extension/MapBoxLayer.cs

@@ -43,7 +43,7 @@ namespace Virgis {
             Enum.TryParse<ImagerySourceType>(props.imagerySourceType, true, out tmpdata.st);
             Enum.TryParse<ElevationLayerType>(props.elevationLayerType, true, out tmpdata.lt);
             Enum.TryParse<ElevationSourceType>(props.elevationSourceType, true, out tmpdata.et);
-            tmpdata.origin = GeoAppState.instance.project.Origin;
+            tmpdata.origin = State.instance.project.Origin;
             tmpdata.MapSize = props.MapSize;
             tmpdata.MapScale = props.MapScale;
         }