Change set shared spec assumes resource does not have optimistic locking enabled

[coblej]

This change set shared spec -- https://github.com/samvera/valkyrie/blob/v2.0.2/lib/valkyrie/specs/shared_specs/change_set.rb#L76-L80 -- assumes that optimistic locking is not enabled on the underlying resource. When the shared spec is used in downstream applications, it will pass or fail depending on whether the resource in the application has optimistic locking enabled or not.

[coblej]

Perhaps a better expectation for this test would be expect(change_set.optimistic_locking_enabled?).to eq change_set.resource.optimistic_locking_enabled? ?