tests/test-gendoc-zh_CN.t

ui: enable pager always for explicit --pager=on (issue5580)

Before this patch, explicit --pager=on is unintentionally ignored by
any disabling factor, even if priority of it is less than --pager=on
(e.g. "[ui] paginate = off").

#require docutils gettext

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