keep order in list of checkpoints when loading model that doesn't have a checksum

checkpoints_loaded = collections.OrderedDict()

def replace_key(d, key, new_key, value):

    keys = list(d.keys())

    d[new_key] = value

    if key not in keys:

        return d

    index = keys.index(key)

    keys[index] = new_key

    new_d = {k: d[k] for k in keys}

    d.clear()

    d.update(new_d)

    return d

class CheckpointInfo:

    def __init__(self, filename):

        self.filename = filename

        if self.shorthash not in self.ids:

            self.ids += [self.shorthash, self.sha256, f'{self.name} [{self.shorthash}]', f'{self.name_for_extra} [{self.shorthash}]']

        checkpoints_list.pop(self.title, None)

        old_title = self.title

        self.title = f'{self.name} [{self.shorthash}]'

        self.short_title = f'{self.name_for_extra} [{self.shorthash}]'

        replace_key(checkpoints_list, old_title, self.title, self)

        self.register()

        return self.shorthash