clean code

src/server/views/widget/alert_breaking_changes.html

@@ -1,7 +0,0 @@
-{# Added in v3.4.6 }
-
-{% if getConfig('crowi', 'security:basicName') || getConfig('crowi', 'security:basicSecret') %}
-<div class="myadmin-alert alert alert-warning mb-0">
-  <i class="icon-exclamation"></i>
-</div>
-{% endif %}