Init polygon title/Description to that in Designer (#2144)

Co-authored-by: Li Li <lili2014@Lis-MacBook-Pro.home>

appinventor/components/src/com/google/appinventor/components/runtime/Polygon.java

@@ -112,6 +112,7 @@ public class Polygon extends PolygonBase implements MapPolygon {
     clearGeometry();
     map.getController().updateFeaturePosition(this);
     map.getController().updateFeatureHoles(this);
+    map.getController().updateFeatureText(this);
   }
 
   @Override