login: Focus the username field on load

Wolfram wanted a small usability improvement that's easy to add: placing
the cursor automatically in the user name field when loading the login
page.

Suggested-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Acked-by: Stephen Finucane <stephen.finucane@intel.com>

patchwork/templates/patchwork/login.html

@@ -3,6 +3,13 @@
 {% block title %}Login{% endblock %}
 {% block heading %}Login{% endblock %}
 
+{% block headers %}
+  <script type="text/javascript">
+    $(function() {
+        $('#id_username').focus()
+    });
+  </script>
+{% endblock %}
 
 {% block body %}
 <form method="post">