Mine in my config is false so i wonder if you have autoupdate configured or a plugin that has changed that value...
appears to be used in the ow_updates folder
/* code to move custom default avatars to clouds */
if ( defined('OW_USE_AMAZON_S3_CLOUDFILES') && OW_USE_AMAZON_S3_CLOUDFILES || defined('OW_USE_CLOUDFILES') && OW_USE_CLOUDFILES )
{
$storage = Updater::getStorage();
$conf = json_decode(Updater::getConfigService()->getValue('base', 'default_avatar'), true);
$dir = OW_DIR_USERFILES . 'plugins' . DS . 'base' . DS . 'avatars'. DS;
if ( !empty($conf[1]) )
{
$path = $dir . $conf[1];
if ( file_exists($path) )
{
$storage->copyFile($path, $path);
}
}
if ( !empty($conf[2]) )
{
$path = $dir . $conf[2];
if ( file_exists($path) )
{
$storage->copyFile($path, $path);
}
}
}