Ensure the title field is reset after uploading an image.

I'm not sure why calling reset() on the form wasn't doing this in firefox 2. I've left that line in just in case it actually works on other browsers.

htdocs/artefact/internal/profileicons.php

@@ -143,6 +143,7 @@ function postSubmit(form, data) {
     quotaUpdate();
     if (!data.error) {
         $(form).reset();
+        $('upload_title').value = '';
     }
 }