Fixing javascript inside upload page

Signed-off-by: man13 <man13@inf.ufpr.br>

app/views/learning_objects/_form.html.erb

@@ -74,7 +74,7 @@
       linkInput = $("#link-input");
 
   radioButtons.change(function (e) {
-    if ("Website externo" == $(this).nextSibling) {
+    if ("Website externo" == ($("input:radio:checked")[0].nextSibling.textContent)) {
       linkInput.slideDown();
     } else {
       linkInput.slideUp();