Remove ZCAP-LD from `PermissionController` state

Requires: #4239

Following #4239, we should remove all ZCAP-LD-specific properties from the permission controller's state. It's time we admit that our wallet permissions have, in their present form, nothing to do with delegatable, linked-data object capabilities. (Although, we can conceive of permissions that manage / enable the creation of such capabilities.)

Start with prerequisite issue #4239, then locate the PermissionController state and identify its ZCAP-LD-specific properties. Remove those properties from the state and update any affected references or tests; done means the controller no longer carries ZCAP-LD-specific state.

Written by the indexing model from the issue text.