Fix Rubocop warnings

Author: n-rodriguez

lib/simple_navigation_bootstrap/rendered_item.rb

@@ -121,7 +121,8 @@ def dropdown_submenu_link
 
       def simple_link
         link_options[:method] ||= item.method
-        link_to(item.name, (item.url || '#'), link_options)
+        url = item.url || '#'
+        link_to(item.name, url, link_options)
       end
 
   end