Form constructor for the form that clears out the log.
function dblog_clear_log_form($form) {
$form['dblog_clear'] = array(
'#type' => 'fieldset',
'#title' => t('Clear log messages'),
'#description' => t('This will permanently remove the log messages from the database.'),
'#collapsible' => TRUE,
'#collapsed' => TRUE,
);
$form['dblog_clear']['clear'] = array(
'#type' => 'submit',
'#value' => t('Clear log messages'),
'#submit' => array(
'dblog_clear_log_submit',
),
);
return $form;
}