Add test to properly test down with a block

down is only called with a block from the rake tasks where it passes a
`SCOPE`. Technically this was tested but since we don't run all the
migrations we're not actually testing the down works with a `SCOPE`. To
ensure we're testing both we can run `db:migrate` again to migrate users
and then run `down` with a scope to test that only the bukkits migration
is reverted.

Updates test to prevent having to fix regressions like we did in
4d4db4c.

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