drawdag: abide by new createmarkers() API The `obsolete.createmarkers()` API was changed in 6335c0de80fa (obsolete: allow multiple predecessors in createmarkers, 2018-09-22) to prefer its precursors input to be a tuple instead of a single precursor. Let's fix `drawdag.py` to comply. Differential Revision: https://phab.mercurial-scm.org/D8149

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  $ hg init

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  $ echo This is file a1 > a

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  $ hg add a

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  $ hg commit -m "commit #0"

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  $ ls

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  a

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  $ echo This is file b1 > b

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  $ hg add b

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  $ hg commit -m "commit #1"

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  $ hg co 0

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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

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B should disappear

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  $ ls

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  a