improve image upload example

Author: lovasoa

examples/image gallery with user uploads/login.sql

@@ -5,6 +5,8 @@ select 'text' as type, 'Username' as name, true as required;
 select 'password' as type, 'Password' as name, true as required;
 
 
-select 'alert' as component, 'You are not logged in' as title,
-       'Sorry, we could not log you in. Please try again.' as description
+select 'alert' as component,
+    'danger' as color,
+    'You are not logged in' as title,
+    'Sorry, we could not log you in. Please try again.' as description
 where $error is not null;