Merge enter into update selection for view_on_osm link

(closes #3778)

modules/ui/view_on_osm.js

@@ -13,15 +13,18 @@ export function uiViewOnOSM(context) {
         var link = selection.selectAll('.view-on-osm')
             .data([0]);
 
-        link.enter()
+        var enter = link.enter()
             .append('a')
             .attr('class', 'view-on-osm')
             .attr('target', '_blank')
-            .call(svgIcon('#icon-out-link', 'inline'))
+            .call(svgIcon('#icon-out-link', 'inline'));
+
+        enter
             .append('span')
             .text(t('inspector.view_on_osm'));
 
         link
+            .merge(enter)
             .attr('href', context.connection().entityURL(entity));
     }