copies-sdc: no longer use revlogv2 in `test-copies-in-changeset.t`...
copies-sdc: no longer use revlogv2 in `test-copies-in-changeset.t`
We only need changelog-v2 and its usage is automatically inferred. So we can
simplify the test by dropping this.
This is important to test future simplification of the update process in the
coming changesets.
