Corrects a bug with uploadprogress ahen uploading a file

main/document/upload.php

@@ -267,7 +267,7 @@ $form -> addElement('html', '</div>');
 
 // Button upload document
 $form->addElement('style_submit_button', 'submitDocument', get_lang('SendDocument'), 'class="upload"');
-$form->add_real_progress_bar('DocumentUpload', 'user_upload');
+$form->add_real_progress_bar('DocumentUpload', 'file');
 
 $defaults = array('index_document' => 'checked="checked"');
 
@@ -300,4 +300,4 @@ $headers = array(get_lang('Send') , get_lang('Send').' ('.get_lang('Simple').')'
 echo Display::tabs($headers, array($multiple_form, $simple_form ),'tabs');
 
 // Footer
-Display::display_footer();
+Display::display_footer();