Change evaluate->execute

This was causing a bug in our Javascript execution for if
statements, which caused working forms to be marked as defunct.

Paired on by me & Peter

Author: hartsick

lib/congress_forms/actions.rb

@@ -161,7 +161,7 @@ def perform(browser, params={})
 
     class Javascript < Base
       def perform(browser, params={})
-        browser.driver.evaluate_script(value)
+        browser.driver.execute_script(value)
       end
     end