Don't show confirmation message when disabled delete link in the context menu (#12199).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10715 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/context_menus_helper.rb

@@ -26,8 +26,8 @@ module ContextMenusHelper
     end
     if options.delete(:disabled)
       options.delete(:method)
-      options.delete(:confirm)
-      options.delete(:onclick)
+      options.delete(:data)
+      options[:onclick] = 'return false;'
       options[:class] << ' disabled'
       url = '#'
     end