tests/test-gendoc-sv.t

narrow: drop explicit dirstate write

The dirstate is written when the wlock is released, so we don't need
to write it explicitly in updateworkingcopy(). I don't know why I put
it there in the first place (tests pass without it even in the commit
that introduced it).

Differential Revision: https://phab.mercurial-scm.org/D5515

#require docutils gettext

  $ $TESTDIR/check-gendoc sv
  checking for parse errors