Add emphasis to web domain security warning dialog

Author: Kristan Kenney

web/templates/admin/add_web.html

@@ -50,7 +50,7 @@
                             <td class="step-top">
                                 <span class="page-title"><?=__('Add Web Domain')?></span>
                                 <?php if ($user == 'admin') { ?>
-                                <span class="alert alert-info alert-with-icon">
+                                <span class="alert alert-danger alert-with-icon">
                                     <i class="fas fa-exclamation"></i>
                                     <?=__('Avoid adding web domains on admin account')?>
                                 </span>