ThreadRepository::getDefaultThreadListSortOptions doesn't properly support multi-column sorting

[Xon]

The ThreadRepository::getDefaultThreadListSortOptions returns a list of valid sorts, and "supports" multi-column sorting.

Suppose an add-on defines a new multi-column sort option like so;
PHP:

public function getDefaultThreadListSortOptions($forAdminConfig): array
{
    $options = parent::getDefaultThreadListSortOptions($forAdminConfig);
    $options['MyNewColumn'] = [
        ['MyNewColumn'],
        ['last_post_date'],
    ];
    return $options;
}

Then the filter functionality...

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