Reduced the bounding box when resolving share link

src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/OLMapManager.java

@@ -167,7 +167,7 @@ public class OLMapManager {
 			geoWidth = (bboxWidth / w) * (16 / 2);
 		} else {
 			// data point selection for coordinate loaded from the centroid
-			geoWidth = (bboxWidth / w) / 20;
+			geoWidth = (bboxWidth / w) / 60;
 			GWT.log("geo width: "+geoWidth);
 		}