fix(form): make a difference between value 0 and false for radio buttons

A form gets radio values wrong, if one of them has a value of 0, but returns false instead

Author: lubber-de

src/definitions/behaviors/form.js

@@ -706,7 +706,7 @@ $.fn.form = function(parameters) {
                 }
                 else {
                   if(isRadio) {
-                    if(values[name] === undefined || values[name] == false) {
+                    if(values[name] === undefined || values[name] === false) {
                       values[name] = (isChecked)
                         ? value || true
                         : false