Doesn't work with md5 storage ids

When the storage id is too long to fit in the oc_storages table, it is replaced with a md5 of its value.

So the script needs to also md5() the value when longer than 64 chars: https://github.com/nextcloud-gmbh/mtime_fixer_tool_kit/blob/master/list_problematic_files_on_fs.sh#L24

See https://github.com/nextcloud/server/blob/master/lib/private/Files/Cache/Storage.php#L109

@artonge 