[sfUnobstrusiveWidgetPlugin] fixed range widget to be able to use it with non UO widget
[sfUnobstrusiveWidgetPlugin] fixed range widget to be able to use it with non UO widget

git-svn-id: e066ce25d2acef5a8ddbfbadd130dd6243c8df74@25140 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfUnobstrusiveWidgetPlugin,Symfony-Plugins/sfUnobstrusiveWidgetPlugin