CRM_Contact_BAO_GroupContact::removeContactsFromGroup() wrong $op with 'Deleted'

CRM_Contact_Page_View_GroupContact::del() calls CRM_Contact_BAO_GroupContact::removeContactsFromGroup() with $status == 'Deleted' when permanently removing a contact from a group.

In this case CRM_Contact_BAO_GroupContact::removeContactsFromGroup() assigns the local variable $op = 'edit', but I think the value should be 'delete'. The $op variable is later passed onto a hook invocation at the end of the function. The value of $op is important to hook implementers because the value of $op is the only way to tell what kind of operation is being performed.

Patch attached.