tests: using a more universal rebase call
In Mercurial 5.3, `source` and `base` are single valued, hence just a string, whereas in current default branch, future 5.4, they become lists. We could fix that by version introspection, but in that case, we're rebasing a topic with a single changeset, so that switching to the implicit form, or `rev`, which is already expected to be a list should work for both versions.
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