fix broken webmail and logo url in admin

core/admin/mailu/ui/templates/base.html

@@ -28,7 +28,7 @@ class="hold-transition skin-blue sidebar-mini"
   <div class="wrapper">
     {% block navbar %}
     <header class="main-header">
-      <a href="/admin/" class="logo">
+      <a href="{{ config["WEB_ADMIN"] }}" class="logo">
         <span class="logo-lg">{{ config["SITENAME"] }}</span>
       </a>
     </header>

core/admin/mailu/ui/templates/sidebar.html

@@ -69,7 +69,7 @@
     <li class="header">{% trans %}Go to{% endtrans %}</li>
     {% if config["WEBMAIL"] != "none" %}
     <li>
-      <a href="{{ config["WEB_WEBMAIL"] }}/">
+      <a href="{{ config["WEB_WEBMAIL"] }}">
         <i class="fa fa-envelope-o"></i> <span>{% trans %}Webmail{% endtrans %}</span>
       </a>
     </li>