In intialiseContainer, add acl.default

[michielbdejong]

This will probably be superseded by https://github.com/inrupt/launcher-exploration/tree/plandoc but I noticed that this function (whose name has a typo btw) only grants acl.accessTo and not acl.default. That means it would only affect the ACL of the folder itself, not of the items contained in it, which is probably not what is meant.

Note that rdf-namespaces doesn't have acl.default, but it does have the old (deprecated) name for it, namely acl.defaultForNew.