Remove superfluous head tag and move final script tag into body

html/update.html

@@ -14,6 +14,6 @@
       Choose a firmware update file to upload: <input name="uploadedfile" type="file" /><br />
     <input type="submit" value="Upload File" />
     </form>
+    <script src="/navigation.js"></script>
   </body>
-<script src="/navigation.js"></script>
 </html>