Cleaner surveyurl for form action

This update action url for survey form

Move to /survey/index to the url with id inside. 
Tested with get and path

With:

		'urlManager' => array(
			'urlFormat' => 'path',
			'showScriptName' => false,
		),

url is /1234, really more clean :)

See : http://bugs.limesurvey.org/view.php?id=9111 too
And another think : this allow eaily a send url by email