gluon-web-model: update inputs on form reset

Register to 'reset' event on form element and make call to 'update' function
delayed in 'data-update' handler to allow the form values to update beforehand.

When using a form's 'reset' button, form field visibility was not updated.
This could lead to situations where a checkbox had to be toggled again
twice to display the detail text inputs. (Example taken from private
wifi package)

(cherry picked from commit bf090a8a83)
(cherry picked from commit 02e213a718)

package/gluon-web-model/files/lib/gluon/web/view/model/form.html

@@ -1,4 +1,4 @@
-<form method="post" enctype="multipart/form-data" action="<%|url(request)%>">
+<form method="post" enctype="multipart/form-data" action="<%|url(request)%>" data-update="reset">
 	<input type="hidden" name="token" value="<%=token%>" />
 	<input type="hidden" name="<%=id%>" value="1" />
 

package/gluon-web-model/javascript/gluon-web-model.js

@@ -517,7 +517,7 @@
 		for (var i = 0, node; (node = nodes[i]) !== undefined; i++) {
 			var events = node.getAttribute('data-update').split(' ');
 			for (var j = 0, event; (event = events[j]) !== undefined; j++) {
-				bind(node, event, update);
+				bind(node, event, function () {setTimeout(update, 0);});
 			}
 		}