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merge: replace a repo.lookup('.') by more typical repo['.'].node()

Authored by martinvonz.

Description

merge: replace a repo.lookup('.') by more typical repo['.'].node()

The repo.lookup('.') form comes from b3311e26f94f (merge: fix
--preview to show all nodes that will be merged (issue2043).,
2010-02-15). I don't know why that commit changed from repo['.'],
but I don't think there's any reason to do that. Note that performance
should not be a reason (anymore?), because repo.lookup() is
implemented by first creating a context object.

Differential Revision: https://phab.mercurial-scm.org/D7998