jq: Update jQuery UI References

This updates the references to the old jQuery UI filename to the new
filename. (this needs #4672 merged first)

include/staff/login.tpl.php

@@ -141,6 +141,6 @@ if (count($ext_bks)) { ?>
         #loginBox:after { background-color: white !important; }
     </style>
     <![endif]-->
-    <script type="text/javascript" src="<?php echo ROOT_PATH; ?>js/jquery-ui-1.10.3.custom.min.js"></script>
+    <script type="text/javascript" src="<?php echo ROOT_PATH; ?>js/jquery-ui-1.12.1.custom.min.js"></script>
 </body>
 </html>