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beautifygraph: don't substitute anything for 'X' in rendered graphs

Authored by hooper.

Description

beautifygraph: don't substitute anything for 'X' in rendered graphs

It looks like we never actually render graphs this way, although there's an
example in a comment next to the code that prevents it from being needed (see
graphmod.ascii()).

Differential Revision: https://phab.mercurial-scm.org/D5103