Fix test failures with FSX caused by r1567023.
Fix test failures with FSX caused by r1567023.

* subversion/libsvn_fs_x/noderevs.c
  (svn_fs_x__write_noderevs_container): We forgot to reduce the number
                                        of sub-streams when we reduced
                                        the number of struct members.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1575642 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion