hide no_username support message on setup

fixes #74.

html/setup.html

@@ -249,8 +249,8 @@
                         </label>
                         <label class="row switch">
                             <input type="checkbox" id="email-no_username"><span>{{ .lang.Email.useEmailAsUsername }}</span>
-                        </label>
                             <p class="support mb-1">{{ .lang.Email.useEmailAsUsernameNotice }}</p>
+                        </label>
                         <label class="label">
                             <span class="mt-half">{{ .lang.Email.fromAddress }}</span>
                             <input type="email" class="input ~neutral !normal mt-half mb-1" id="email-address" placeholder="mail@jellyf.in">