tests/test-gendoc-zh_TW.t

graft: reuse the --log value passed initially in `hg graft --continue` (BC)

We now stores the value of --log flag passed initially in the graftstate and
reuse that value when doing `hg graft --continue` which is a nice behavior.

The test updates demonstrate the fix.

Since we now preserve the value by default, drop the mention of `--log` flag
from the hint which we see after conflicts.

Differential Revision: https://phab.mercurial-scm.org/D3662

#require docutils gettext

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