Ensure bootstrap mode notice is hidden in wizard

Author: angusmcleod

assets/stylesheets/common/custom/header.scss

@@ -3,7 +3,8 @@ body.custom-wizard {
   .global-notice,
   .create-topics-notice,
   .top-notices-outlet,
-  .consent_banner {
+  .consent_banner,
+  .bootstrap-mode-notice {
     display: none;
   }
 }