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rebase: don't create merge when continuing rebase interrupted by old hg

Authored by martinvonz.

Description

rebase: don't create merge when continuing rebase interrupted by old hg

This fixes the bug described and demonstrated in the previous
commit. It does so by practically undoing 8082a77cc3a2 (rebase: remove
some redundant setting of dirstate parents, 2020-01-10).

Differential Revision: https://phab.mercurial-scm.org/D8356