Fix a typo in the base html template

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

@@ -5,7 +5,7 @@
 {% block styles %}
 {{super()}}
 <link rel="stylesheet" href="{{ url_for('.static', filename='select2/css/select2.min.css') }}">
-<link rel="stylesheet" href="{{ url_for('.static', filename='fontawesome/css/font-awesome.min.css) }}">
+<link rel="stylesheet" href="{{ url_for('.static', filename='fontawesome/css/font-awesome.min.css') }}">
 <link rel="stylesheet" href="{{ url_for('.static', filename='adminlte/css/AdminLTE.min.css') }}">
 <link rel="stylesheet" href="{{ url_for('.static', filename='adminlte/css/skin-blue.min.css') }}">
 <link rel="stylesheet" href="{{ url_for('.static', filename='app.css') }}">