tests/test-gendoc-zh_TW.t

revlog: add the appropriate flag is sidedata are passed to `addrevision`

If we need to store sidedata, we need the flag to be set and the associated
processing to be called.

Differential Revision: https://phab.mercurial-scm.org/D6894

#require docutils gettext

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