Contacts removed from a Group still appear as in the group if they are in a child group

When a contact is removed from a group, they are still listed in the list of all contacts for the group if that contact is a member of a child group.

To replicate:

• Create a group "Parent"
• Create a group "Child" with "Parent" as a parent group
• Add some contacts to "Child"
• Observe that contacts in "Child" are appropriately listed in "Parent"
• Add a contact who is in "Child" to "Parent"
• Remove the above contact from "Parent"
• On the contact's group tab, they will be listed as removed from "Parent", but if you show all contacts in "Parent", the contact will still be included.