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clean: delete obsolete unlinking of .hg/graftstate

Authored by martinvonz.

Description

clean: delete obsolete unlinking of .hg/graftstate

The responsibility for clearing it is now in
cmdutil.clearunfinished(), so we shouldn't have to unlink it in
hg.clean().

Differential Revision: https://phab.mercurial-scm.org/D7992