CollectionGroup::to_json_details_for_group derived manage from
!read_only && !hide_passwords, so the group permission "Can edit items"
was reported as "Can manage collection" by collections/details, while
groups/<id>/details reported the stored value. Saving the collection
access dialog in the web vault then persisted manage=true.
Fixes#7794
Co-authored-by: Alexander Widak <deltatree.widak@gmail.com>
